WO2018140729A1 - Glucagon receptor binding proteins and methods of use thereof - Google Patents
Glucagon receptor binding proteins and methods of use thereof Download PDFInfo
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- WO2018140729A1 WO2018140729A1 PCT/US2018/015452 US2018015452W WO2018140729A1 WO 2018140729 A1 WO2018140729 A1 WO 2018140729A1 US 2018015452 W US2018015452 W US 2018015452W WO 2018140729 A1 WO2018140729 A1 WO 2018140729A1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
- C07K16/18—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans
- C07K16/28—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants
- C07K16/2869—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants against hormone receptors
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K39/00—Medicinal preparations containing antigens or antibodies
- A61K39/395—Antibodies; Immunoglobulins; Immune serum, e.g. antilymphocytic serum
- A61K39/39533—Antibodies; Immunoglobulins; Immune serum, e.g. antilymphocytic serum against materials from animals
- A61K39/3955—Antibodies; Immunoglobulins; Immune serum, e.g. antilymphocytic serum against materials from animals against proteinaceous materials, e.g. enzymes, hormones, lymphokines
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K45/00—Medicinal preparations containing active ingredients not provided for in groups A61K31/00 - A61K41/00
- A61K45/06—Mixtures of active ingredients without chemical characterisation, e.g. antiphlogistics and cardiaca
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P3/00—Drugs for disorders of the metabolism
- A61P3/08—Drugs for disorders of the metabolism for glucose homeostasis
- A61P3/10—Drugs for disorders of the metabolism for glucose homeostasis for hyperglycaemia, e.g. antidiabetics
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P43/00—Drugs for specific purposes, not provided for in groups A61P1/00-A61P41/00
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K39/00—Medicinal preparations containing antigens or antibodies
- A61K2039/505—Medicinal preparations containing antigens or antibodies comprising antibodies
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K2317/00—Immunoglobulins specific features
- C07K2317/20—Immunoglobulins specific features characterized by taxonomic origin
- C07K2317/21—Immunoglobulins specific features characterized by taxonomic origin from primates, e.g. man
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K2317/00—Immunoglobulins specific features
- C07K2317/20—Immunoglobulins specific features characterized by taxonomic origin
- C07K2317/24—Immunoglobulins specific features characterized by taxonomic origin containing regions, domains or residues from different species, e.g. chimeric, humanized or veneered
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K2317/00—Immunoglobulins specific features
- C07K2317/30—Immunoglobulins specific features characterized by aspects of specificity or valency
- C07K2317/31—Immunoglobulins specific features characterized by aspects of specificity or valency multispecific
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K2317/00—Immunoglobulins specific features
- C07K2317/30—Immunoglobulins specific features characterized by aspects of specificity or valency
- C07K2317/34—Identification of a linear epitope shorter than 20 amino acid residues or of a conformational epitope defined by amino acid residues
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K2317/00—Immunoglobulins specific features
- C07K2317/50—Immunoglobulins specific features characterized by immunoglobulin fragments
- C07K2317/56—Immunoglobulins specific features characterized by immunoglobulin fragments variable (Fv) region, i.e. VH and/or VL
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K2317/00—Immunoglobulins specific features
- C07K2317/50—Immunoglobulins specific features characterized by immunoglobulin fragments
- C07K2317/56—Immunoglobulins specific features characterized by immunoglobulin fragments variable (Fv) region, i.e. VH and/or VL
- C07K2317/565—Complementarity determining region [CDR]
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K2317/00—Immunoglobulins specific features
- C07K2317/70—Immunoglobulins specific features characterized by effect upon binding to a cell or to an antigen
- C07K2317/76—Antagonist effect on antigen, e.g. neutralization or inhibition of binding
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K2317/00—Immunoglobulins specific features
- C07K2317/90—Immunoglobulins specific features characterized by (pharmaco)kinetic aspects or by stability of the immunoglobulin
- C07K2317/92—Affinity (KD), association rate (Ka), dissociation rate (Kd) or EC50 value
Definitions
- the present disclosure generally relates to proteins, such as antibodies, that bind to glucagon receptor (GCGR), including human GCGR, as well as methods of using the binding proteins for the treatment and/or prevention of diseases.
- proteins such as antibodies, that bind to glucagon receptor (GCGR), including human GCGR, as well as methods of using the binding proteins for the treatment and/or prevention of diseases.
- GCGR glucagon receptor
- Glucagon is a 29-amino acid peptide hormone secreted by pancreatic alpha cells. Glucagon secretion generally increases in response to falling blood glucose levels, for example, during fasting. Glucagon can raise the concentration of blood glucose by stimulating hepatic glycogenolysis and gluconeogenesis. In contrast, insulin is produced by pancreatic beta cells. The stimulus for insulin secretion is high blood glucose. Although there is always a low level of insulin secreted by the pancreas, the amount secreted into the blood increases as blood glucose rises. Similarly, as blood glucose falls, the amount of insulin secreted by the pancreatic beta cells goes down. Acting together, glucagon and insulin help maintain normal blood glucose levels.
- Glucagon binds to and activates the glucagon receptor (GCGR).
- GCGR is a member of the class B type of G-protein coupled receptors (GPCRs). GPCRs are characterized by a N-terminal extracellular domain, a core seven alpha-helix transmembrane region, and a cytoplasmic C-terminal region. Typically, GPCRs are associated with one or more intracellular signaling pathways via effector proteins. The effector proteins are heterotrimeric guanine-nucleotide binding proteins (G proteins), such as Ga (Gas, God, and Goto), ⁇ , and Gy.
- G proteins heterotrimeric guanine-nucleotide binding proteins
- GCGR stimulation can result in activation of adenylyl cyclase and cAMP -dependent intracellular signaling pathways as well as phosphoinositol-mediated signaling.
- gluconeogenic enzymes including phosphoenolpyruvate carboxykinase, fructose- 1,6-bisphosphatase, and glucose-6-phosphatase, promote gluconeogenesis.
- GCGR signaling can result in activation of glycogen phosphorylase and inhibition of glycogen synthase, and thereby promote glycogenolysis.
- Diseases, disorders, or conditions associated with unregulated blood glucose levels include, hyperglycemia and the health issues resulting from hyperglycemia, including Type 1 and Type 2 diabetes.
- Diseases, disorders, or conditions associated with beta cell dysfunction include hyperglycemia and metabolic diseases, such as Type 1 and Type 2 diabetes.
- a subject's ability to produce and secrete insulin into the blood and to regulate blood glucose can be severely impaired when the subject has a disease associated with beta cell dysfunction.
- New methods and therapeutic agents for treating diseases, disorders, or conditions associated with unregulated blood glucose levels, hyperglycemia, and/or beta cell dysfunction are needed.
- the present disclosure provides proteins that bind to glucagon receptors (GCGRs), including binding proteins such as antibodies, and methods of their use.
- GCGR-binding proteins e.g., antibodies
- the GCGR-binding proteins may be antagonists (e.g., inhibit binding of glucagon to GCGR, inhibit glucagon-induced signaling of GCGR, or inhibit a glucagon/GCGR complex).
- the present disclosure also provides methods for treating or preventing beta cell defective diseases, disorders, or conditions, or symptoms thereof, using effective amounts of GCGR-binding proteins described herein (e.g., antibodies).
- beta cell defective diseases, disorders, or conditions include unregulated blood glucose, hyperglycemia, metabolic diseases (e.g., Type 1 and Type 2 diabetes), and/or any disease in which there is a loss of beta cell function.
- binding proteins including antibodies or fragments thereof, that (i) bind to human GCGR, (ii) inhibit glucagon signaling, (iii) inhibit GCGR signaling, and/or (iv) compete with glucagon for interaction with GCGR (e.g., antibodies comprising CDR, heavy chain variable region, and/or light chain variable region sequences shown in Tables 1-10).
- the GCGR-binding proteins are antibodies or humanized antibodies that bind to a GCGR polypeptide, a GCGR fragment, or a GCGR epitope.
- an anti- GCGR antibody comprises at least one heavy chain CDR and/or at least one light chain CDR of a monoclonal antibody designated as 6B5, 3H5, 5B 11, 1C 1, 1C3, 1H2, 4F8, 13G9, 14F4, or 14E9 described herein, (e.g., Tables 1-10) or a humanized variant thereof.
- an anti- GCGR antibody further comprises at least one framework region of a human immunoglobulin amino acid sequence or a variant thereof.
- a GCGR-binding protein (e.g., an antibody) comprises six CDRs or less than six CDRs of an antibody defined in Tables 1-10.
- a GCGR-binding protein (e.g., an antibody) comprises one, two, three, four, five, or six CDRs selected from heavy chain CDR1, CDR2, CDR3 and/or light chain CDR1, CD2, CDR3 of an antibody defined in Tables 1-10.
- a GCGR-binding protein (e.g., an antibody) comprises one, two, three, four, five, or six CDRs of a monoclonal antibody designated as 6B5, 3H5, 5B 1 1, 1C 1, 1C3, 1H2, 4F8, 13G9, 14F4, or 14E9 described herein or a humanized variant thereof.
- a GCGR-binding protein (e.g., an antibody) further comprises a scaffold region or framework region(s) of a human
- immunoglobulin amino acid sequence or a variant thereof.
- a GCGR-binding protein is an antibody.
- the antibody is a humanized antibody, a monoclonal antibody, a recombinant antibody, an antigen-binding fragment, or any combination thereof.
- the antibody is a monoclonal antibody.
- the antibody is a humanized antibody.
- the antibody is a humanized monoclonal antibody that binds to a GCGR polypeptide (e.g., a cell-surface expressed or a soluble GCGR), a GCGR fragment, or a GCGR epitope.
- the antibody is a human antibody.
- the antibody is a chimeric antibody.
- the antibody is a bispecific or multispecific antibody. In some embodiments, the antibody is an antibody fragment comprising at least one antigen-binding site. In some embodiments, the antibody is an IgG antibody. In some embodiments, the antibody is an IgGl antibody, an IgG2 antibody, or an IgG4 antibody.
- binding proteins including antibodies or fragments thereof, that (i) bind to an epitope of human GCGR and cynomolgus ("cyno") monkey GCGR recognized by an antibody comprising a heavy chain variable region comprising SEQ ID NO: 25 and a light chain variable region comprising SEQ ID NO:26; or (ii) compete for binding to human GCGR with an antibody comprising a heavy chain variable region comprising SEQ ID NO: 25 and a light chain variable region comprising SEQ ID NO: 26.
- binding proteins, including antibodies or fragments thereof are provided herein that bind to a region, including an epitope, of human GCGR or cyno GCGR.
- GCGR-binding proteins e.g., antibodies
- the GCGR-binding protein is an antibody and that antibody is a monoclonal antibody, a humanized antibody, human antibody, and/or chimeric antibody.
- a GCGR-binding protein is an antibody that specifically binds human GCGR, wherein the antibody comprises: (a) a heavy chain CDR1 comprising GFTFTNHWLG (SEQ ID NO: 1), a heavy chain CDR2 comprising DIYPGGYYINYNEKFKG (SEQ ID NO: 2), and a heavy chain CDR3 comprising HTNYGSDY (SEQ ID NO: 3); and/or (b) a light chain CDR1 comprising
- a GCGR- binding protein is an antibody that specifically binds human GCGR, wherein the antibody comprises (a) a heavy chain variable region having at least 90% sequence identity to SEQ ID NO:25 and a light chain variable region having at least 90% sequence identity to SEQ ID NO:26; or (b) a heavy chain variable region having at least 90% sequence identity to SEQ ID NO: 220 and a light chain variable region having at least 90% sequence identity to SEQ ID NO:221.
- a GCGR-binding protein is an antibody that specifically binds human GCGR, wherein the antibody comprises: (a) a heavy chain variable region having at least 95% sequence identity to SEQ ID NO: 25 and a light chain variable region having at least 95% sequence identity to SEQ ID NO:26; or (b) a heavy chain variable region having at least 95% sequence identity to SEQ ID NO: 220 and a light chain variable region having at least 95% sequence identity to SEQ ID NO: 221.
- a GCGR-binding protein is an antibody that specifically binds human GCGR, wherein the antibody comprises a heavy chain variable region comprising SEQ ID NO:25 and a light chain variable region comprising SEQ ID NO:26.
- a GCGR-binding protein is an antibody that specifically binds human GCGR, wherein the antibody comprises a heavy chain variable region comprising SEQ ID NO:220 and a light chain variable region comprising SEQ ID NO: 221.
- the disclosure provides GCGR-binding proteins (e.g., antibodies) (i) that competitively block (e.g., in a dose-dependent manner) an anti-GCGR antibody described herein (e.g., antibody 6B5 with CDR sequences defined in Table 1) from binding to a GCGR polypeptide (e.g., a cell- surface expressed or a soluble GCGR), a GCGR fragment, or a GCGR epitope, and/or (ii) that bind to a GCGR epitope that is bound by an anti-GCGR antibody described herein (e.g., antibody 6B5).
- a GCGR-binding protein e.g.
- an antibody competitively blocks monoclonal antibody 6B5 described herein or a humanized variant thereof from binding to a GCGR polypeptide (e.g., a cell- surface expressed or a soluble GCGR), a GCGR fragment, or a GCGR epitope.
- a GCGR-binding protein e.g., an antibody
- a GCGR-binding protein competes for specific binding to GCGR with at least one of the anti-GCGR antibodies described herein.
- a GCGR-binding protein (e.g., an antibody) competes for binding to GCGR with a reference antibody, wherein the reference antibody comprises a heavy chain CDRl comprising SEQ ID NO: 1, a heavy chain CDR2 comprising SEQ ID NO: 2, a heavy chain CDR3 comprising SEQ ID NO: 3, a light chain CDRl comprising SEQ ID NO: 4, a light chain CDR2 comprising SEQ ID NO: 5, and a light chain CDR3 comprising SEQ ID NO: 6.
- a GCGR-binding protein (e.g., an antibody) competes for binding to GCGR with a reference antibody, wherein the reference antibody comprises a heavy chain CDRl comprising SEQ ID NO:27, a heavy chain CDR2 comprising SEQ ID NO:28, a heavy chain CDR3 comprising SEQ ID NO:29, a light chain CDRl comprising SEQ ID NO:30, a light chain CDR2 comprising SEQ ID NO:31, and a light chain CDR3 comprising SEQ ID NO:32.
- the reference antibody comprises a heavy chain CDRl comprising SEQ ID NO:27, a heavy chain CDR2 comprising SEQ ID NO:28, a heavy chain CDR3 comprising SEQ ID NO:29, a light chain CDRl comprising SEQ ID NO:30, a light chain CDR2 comprising SEQ ID NO:31, and a light chain CDR3 comprising SEQ ID NO:32.
- a GCGR-binding protein (e.g., an antibody) competes for binding to GCGR with a reference antibody, wherein the reference antibody comprises a heavy chain CDRl comprising SEQ ID NO:53, a heavy chain CDR2 comprising SEQ ID NO:54, a heavy chain CDR3 comprising SEQ ID NO:55, a light chain CDRl comprising SEQ ID NO: 56, a light chain CDR2 comprising SEQ ID NO: 31, and a light chain CDR3 comprising SEQ ID NO:32.
- the reference antibody comprises a heavy chain CDRl comprising SEQ ID NO:53, a heavy chain CDR2 comprising SEQ ID NO:54, a heavy chain CDR3 comprising SEQ ID NO:55, a light chain CDRl comprising SEQ ID NO: 56, a light chain CDR2 comprising SEQ ID NO: 31, and a light chain CDR3 comprising SEQ ID NO:32.
- a GCGR-binding protein (e.g., an antibody) competes for binding to GCGR with a reference antibody, wherein the reference antibody comprises a heavy chain CDRl comprising SEQ ID NO:73, a heavy chain CDR2 comprising SEQ ID NO:74, a heavy chain CDR3 comprising SEQ ID NO:75, a light chain CDRl comprising SEQ ID NO:76, a light chain CDR2 comprising SEQ ID NO:77, and a light chain CDR3 comprising SEQ ID NO:78.
- the reference antibody comprises a heavy chain CDRl comprising SEQ ID NO:73, a heavy chain CDR2 comprising SEQ ID NO:74, a heavy chain CDR3 comprising SEQ ID NO:75, a light chain CDRl comprising SEQ ID NO:76, a light chain CDR2 comprising SEQ ID NO:77, and a light chain CDR3 comprising SEQ ID NO:78.
- a GCGR-binding protein (e.g., an antibody) competes for binding to GCGR with a reference antibody, wherein the reference antibody comprises a heavy chain CDRl comprising SEQ ID NO:99, a heavy chain CDR2 comprising SEQ ID NO: 100, a heavy chain CDR3 comprising SEQ ID NO: 101, a light chain CDRl comprising SEQ ID NO: 102, a light chain CDR2 comprising SEQ ID NO: 103, and a light chain CDR3 comprising SEQ ID NO: 104.
- the reference antibody comprises a heavy chain CDRl comprising SEQ ID NO:99, a heavy chain CDR2 comprising SEQ ID NO: 100, a heavy chain CDR3 comprising SEQ ID NO: 101, a light chain CDRl comprising SEQ ID NO: 102, a light chain CDR2 comprising SEQ ID NO: 103, and a light chain CDR3 comprising SEQ ID NO: 104.
- a GCGR-binding protein (e.g., an antibody) competes for binding to GCGR with a reference antibody, wherein the reference antibody comprises a heavy chain CDRl comprising SEQ ID NO: 124, a heavy chain CDR2 comprising SEQ ID NO: 125, a heavy chain CDR3 comprising SEQ ID NO: 126, a light chain CDRl comprising SEQ ID NO: 127, a light chain CDR2 comprising SEQ ID NO: 128, and a light chain CDR3 comprising SEQ ID NO:6.
- the reference antibody comprises a heavy chain CDRl comprising SEQ ID NO: 124, a heavy chain CDR2 comprising SEQ ID NO: 125, a heavy chain CDR3 comprising SEQ ID NO: 126, a light chain CDRl comprising SEQ ID NO: 127, a light chain CDR2 comprising SEQ ID NO: 128, and a light chain CDR3 comprising SEQ ID NO:6.
- a GCGR-binding protein (e.g., an antibody) competes for binding to GCGR with a reference antibody, wherein the reference antibody comprises a heavy chain CDRl comprising SEQ ID NO: 146, a heavy chain CDR2 comprising SEQ ID NO: 147, a heavy chain CDR3 comprising SEQ ID NO: 148, a light chain CDRl comprising SEQ ID NO: 149, a light chain CDR2 comprising SEQ ID NO: 128, and a light chain CDR3 comprising SEQ ID NO:6.
- the reference antibody comprises a heavy chain CDRl comprising SEQ ID NO: 146, a heavy chain CDR2 comprising SEQ ID NO: 147, a heavy chain CDR3 comprising SEQ ID NO: 148, a light chain CDRl comprising SEQ ID NO: 149, a light chain CDR2 comprising SEQ ID NO: 128, and a light chain CDR3 comprising SEQ ID NO:6.
- a GCGR-binding protein (e.g., an antibody) competes for binding to GCGR with a reference antibody, wherein the reference antibody comprises a heavy chain CDRl comprising SEQ ID NO: 166, a heavy chain CDR2 comprising SEQ ID NO: 167, a heavy chain CDR3 comprising SEQ ID NO: 168, a light chain CDRl comprising SEQ ID NO: 169, a light chain CDR2 comprising SEQ ID NO: 170, and a light chain CDR3 comprising SEQ ID NO: 171.
- the reference antibody comprises a heavy chain CDRl comprising SEQ ID NO: 166, a heavy chain CDR2 comprising SEQ ID NO: 167, a heavy chain CDR3 comprising SEQ ID NO: 168, a light chain CDRl comprising SEQ ID NO: 169, a light chain CDR2 comprising SEQ ID NO: 170, and a light chain CDR3 comprising SEQ ID NO: 171.
- a GCGR-binding protein (e.g., an antibody) competes for binding to GCGR with a reference antibody, wherein the reference antibody comprises a heavy chain CDR1 comprising SEQ ID NO: 190, a heavy chain CDR2 comprising SEQ ID NO: 191, a heavy chain CDR3 comprising SEQ ID NO: 192, a light chain CDR1 comprising SEQ ID NO: 169, a light chain CDR2 comprising SEQ ID NO: 128, and a light chain CDR3 comprising SEQ ID NO: 193.
- the reference antibody comprises a heavy chain CDR1 comprising SEQ ID NO: 190, a heavy chain CDR2 comprising SEQ ID NO: 191, a heavy chain CDR3 comprising SEQ ID NO: 192, a light chain CDR1 comprising SEQ ID NO: 169, a light chain CDR2 comprising SEQ ID NO: 128, and a light chain CDR3 comprising SEQ ID NO: 193.
- a GCGR-binding protein (e.g., an antibody) competes for binding to GCGR with a reference antibody, wherein the reference antibody comprises a heavy chain CDR1 comprising SEQ ID NO: 190, a heavy chain CDR2 comprising SEQ ID NO: 205, a heavy chain CDR3 comprising SEQ ID NO:206, a light chain CDR1 comprising SEQ ID NO:207, a light chain CDR2 comprising SEQ ID NO: 128, and a light chain CDR3 comprising SEQ ID NO:6.
- the reference antibody comprises a heavy chain CDR1 comprising SEQ ID NO: 190, a heavy chain CDR2 comprising SEQ ID NO: 205, a heavy chain CDR3 comprising SEQ ID NO:206, a light chain CDR1 comprising SEQ ID NO:207, a light chain CDR2 comprising SEQ ID NO: 128, and a light chain CDR3 comprising SEQ ID NO:6.
- the antibody that competes for binding to GCGR comprises heavy chain variable region comprising SEQ ID NO: 25 and a light chain variable region comprising SEQ ID NO: 26. In some embodiments, the antibody that competes for binding to GCGR comprises heavy chain variable region comprising SEQ ID NO:220 and a light chain variable region comprising SEQ ID NO:221.
- the antibody that competes for binding to GCGR comprises (a) heavy chain variable region comprising SEQ ID NO:51 and a light chain variable region comprising SEQ ID NO:52; (b) heavy chain variable region comprising SEQ ID NO: 71 and a light chain variable region comprising SEQ ID NO:72; (c) heavy chain variable region comprising SEQ ID NO:97 and a light chain variable region comprising SEQ ID NO:98; (d) heavy chain variable region comprising SEQ ID NO: 122 and a light chain variable region comprising SEQ ID NO: 123; (e) heavy chain variable region comprising SEQ ID NO: 144 and a light chain variable region comprising SEQ ID NO: 145; (f) heavy chain variable region comprising SEQ ID NO: 164 and a light chain variable region comprising SEQ ID NO: 165; (g) heavy chain variable region comprising SEQ ID NO: 188 and a light chain variable region comprising SEQ ID NO: 189; (h) heavy chain variable region comprising SEQ ID NO: 165
- a GCGR-binding protein binds the same epitope on GCGR as at least one of the antibodies described herein. In some embodiments, a GCGR-binding protein binds an epitope on GCGR that overlaps with the epitope on GCGR bound by at least one of the antibodies described herein. In some embodiments, a GCGR-binding protein binds the same epitope as an antibody comprising the heavy chain CDR1, CDR2, and CDR3 and the light chain CDR1, CDR2, and CDR3 of an antibody selected from the group consisting of: 6B5, 3H5, 5B11, 1C1, 1C3, 1H2, 4F8, 13G9, 14F4, and 14E9.
- a GCGR-binding protein binds an epitope that overlap with the epitope bound by an antibody comprising the heavy chain CDR1, CDR2, and CDR3 and the light chain CDR1, CDR2, and CDR3 of an antibody selected from the group consisting of: 6B5, 3H5, 5B 1 1, IC l, 1C3, 1H2, 4F8, 13G9, 14F4, and 14E9.
- a GCGR-binding protein binds the same epitope as an antibody comprising the heavy chain variable region and the light chain variable region from an antibody selected from the group consisting of: Hz6B5, 6B5, 3H5, 5B 1 1, IC l, 1C3, 1H2, 4F8, 13G9, 14F4, and 14E9.
- a GCGR-binding protein binds an epitope that overlaps with the epitope bound by an antibody comprising the heavy chain variable region and the light chain variable region from an antibody selected from the group consisting of: Hz6B5, 6B5, 3H5, 5B 1 1, IC l, 1C3, 1H2, 4F8, 13G9, 14F4, and 14E9.
- a GCGR-binding protein is a humanized antibody comprising a heavy chain having the amino acid sequence of SEQ ID NO:234 and a light chain having the amino acid sequence of SEQ ID NO: 236.
- a GCGR-binding protein (e.g. , an antibody) described herein is combined with, conjugated to, or recombinantly linked to a diagnostic agent, detectable agent, or therapeutic agent.
- the GCGR-binding protein is an antibody that is conjugated to a detectable marker.
- the detectable agent is selected from the group consisting of a radioisotope, a metal chelator, an enzyme, a fluorescent compound, a biolumine scent compound, or a chemiluminescent compound.
- the therapeutic agent is selected from the group consisting of: biguanides and sulfonylureas (e.g., metformin tolbutamide, chlorpropamide,
- acetohexamide, tolazamide, glibenclamide, glyburide, and glipizide thiazolidinediones (e.g., rosiglitazone and pioglitazone), GLP- 1 analogs, PPAR gamma agonists, dipeptidyl peptidase-4 (DPP-4) inhibitors (e.g., JANUVIA and ONGLYZA), bromocriptine, bile acid sequestrants (e.g., colesevelam), insulin (e.g., bolus and basal analogs), alpha glucosidase inhibitors (e.g., acarbose, roglibose), SGLT-2 inhibitors, and appetite suppression or weight loss drugs (e.g., XENICAL).
- DPP-4 dipeptidyl peptidase-4
- bromocriptine e.g., bromocriptine
- a GCGR-binding protein (e.g. , an antibody) described herein inhibits GCGR signaling in cells expressing GCGR. In some embodiments, a GCGR-binding protein inhibits glucagon-induced GCGR signaling. In some embodiments, a GCGR-binding protein inhibits GCGR activity in a cell. In some embodiments, a GCGR-binding protein inhibits cAMP activity.
- a GCGR-binding protein (e.g. , an antibody) described herein (i) reduces blood glucose levels; (ii) increases the level of C-peptide; and/or (iii) increases the level of insulin.
- the level of C-peptide is measured in a blood sample, a serum sample, a plasma sample, or a pancreatic sample.
- the level of insulin is measured in a blood sample, a serum sample, a plasma sample, or a pancreatic sample.
- the disclosure provides a cell comprising or producing a GCGR-binding protein described herein.
- a cell comprises an antibody described herein (e.g., as defined by CDR sequences in Tables 1-10). In some embodiments, a cell comprises the antibody designated 6B5 or the humanized version designated Hz6B5. In some embodiments, a cell produces an antibody described herein (e.g., as defined by CDR sequences in Tables 1-10). In some embodiments, a cell produces the antibody designated 6B5 or the humanized version designated Hz6B5.
- compositions comprising a GCGR-binding protein described herein.
- disclosure provides pharmaceutical compositions comprising a GCGR-binding protein described herein and a pharmaceutically acceptable carrier.
- the GCGR-binding protein is isolated. In some embodiments, the GCGR-binding protein is substantially pure.
- the disclosure provides polynucleotide molecules comprising a
- nucleic acid molecules encode an immunoglobulin heavy chain, an immunoglobulin light chain, a heavy chain variable region, a light chain variable region, heavy chain CDRs, and/or light chain CDRs of GCGR-binding proteins (e.g., antibodies) that bind to GCGR, a GCGR fragment, or a GCGR epitope.
- a GCGR-binding protein e.g. , an antibody
- nucleic acid molecules encode an immunoglobulin heavy chain, an immunoglobulin light chain, a heavy chain variable region, a light chain variable region, heavy chain CDRs, and/or light chain CDRs of GCGR-binding proteins (e.g., antibodies) that bind to GCGR, a GCGR fragment, or a GCGR epitope.
- a nucleic acid molecule encodes a heavy chain variable region and/or a light chain variable region of a monoclonal antibody designated as 6B5, 3H5, 5B 1 1, 1C1, 1C3, 1H2, 4F8, 13G9, 14F4, or 14E9 as described herein (see, e.g. , Tables 1-10), or a humanized variant thereof.
- a nucleic acid molecule further encodes a scaffold region or a framework region of a human immunoglobulin amino acid sequence or a variant thereof.
- a nucleic acid molecule further encodes a scaffold region or a framework region of a human immunoglobulin amino acid sequence or a variant thereof.
- polynucleotide molecule comprises a polynucleotide that encodes a polypeptide of SEQ ID NO:233, SEQ ID NO:234, SEQ ID NO:235, or SEQ ID NO:236.
- a polynucleotide molecule comprises a polynucleotide that encodes a polypeptide comprising SEQ ID NO: 233 and SEQ ID NO: 235.
- a polynucleotide molecule comprises a polynucleotide that encodes a polypeptide comprising SEQ ID NO:234 and SEQ ID NO:236.
- the polynucleotide is isolated. In some embodiments, the polynucleotide is substantially pure.
- vectors that comprise the nucleic acid molecules encoding a GCGR- binding protein (e.g. , an antibody), as well as cells that comprise the vector and/or the polynucleotides.
- the disclosure provides methods of producing a GCGR-binding protein (e.g. , antibody) by culturing host cells provided herein under conditions that promote the production of the GCGR-binding protein.
- the present disclosure provides methods of using the GCGR-binding proteins (e.g. , antibodies) described herein.
- a method of inhibiting GCGR signaling in a cell comprises contacting the cell with a GCGR-binding protein (e.g. , an antibody) described herein.
- the cell expresses human GCGR.
- the GCGR signaling is induced by glucagon.
- a method of reducing or lowering blood glucose levels in a subject comprises administering to the subject a therapeutically effective amount of a GCGR-binding protein (e.g. , an antibody) described herein.
- a method of increasing the level of C-peptide in the blood of a subject comprises administering to the subject a therapeutically effective amount of a GCGR-binding protein (e.g., an antibody) described herein.
- a method of increasing the level of insulin in the blood of a subject comprises administering to the subject a therapeutically effective amount of a GCGR-binding protein (e.g., an antibody) described herein.
- a method of reducing or lowering blood glucose levels and increasing the level of C- peptide in the blood of a subject comprises administering to the subject a therapeutically effective amount of a GCGR-binding protein (e.g., an antibody) described herein.
- a GCGR-binding protein e.g., an antibody
- the level of C-peptide is measured in a blood sample, a serum sample, a plasma sample, or a pancreatic sample.
- the level of insulin is measured in a blood sample, a serum sample, a plasma sample, or a pancreatic sample.
- a method of treating Type 1 diabetes in a subject comprises administering to the subject a therapeutically effective amount of a GCGR-binding protein (e.g. , an antibody) described herein.
- the Type 1 diabetes is latent autoimmune diabetes of adults (LADA).
- a method of treating Type 2 diabetes in a subject comprises administering to the subject a therapeutically effective amount of a GCGR-binding protein (e.g. , an antibody) described herein.
- a method of treating hyperglycemia in a subject comprises administering to the subject a therapeutically effective amount of a GCGR-binding protein (e.g. , an antibody) described herein.
- a method of treating or preventing a disease, disorder or condition associated with beta cell dysfunction in a subject comprises administering to the subject a therapeutically effective amount of a GCGR-binding protein (e.g., an antibody) described herein.
- a method of treating or preventing a beta cell defective disease, disorder or condition, or a symptom thereof, in a subject comprises administering to the subject a therapeutically effective amount of a GCGR- binding protein (e.g. , an antibody) described herein.
- the disease, disorder or condition is hyperglycemia.
- the disease, disorder or condition is Type 1 diabetes.
- the disease, disorder or condition is Type 2 diabetes.
- a method of improving beta cell function in a subject comprises administering to the subject a therapeutically effective amount of a GCGR-binding protein (e.g., an antibody) described herein.
- the improvement in beta cell function is indicated by a decrease in blood glucose, an increase in C-peptide, and/or an increase in insulin.
- the subject receives a daily dosage of insulin. In some embodiments of the methods described herein, the subject does not receive a daily dosage of insulin. In some embodiments of the methods described herein, the subject has Type 1 diabetes or a symptom thereof. In some embodiments of the methods described herein, the subject has Type 2 diabetes, or a symptom thereof. In some embodiments of the methods described herein, the subject has hyperglycemia. In some embodiments of the methods described herein, the subject has insulin resistance. In some embodiments of the methods described herein, the subject has insulin-dependent diabetes. In some embodiments of the methods described herein, the subject has non-insulin dependent diabetes.
- the subject has a beta cell defective disease, disorder, or condition, or a symptom thereof.
- the beta cell defective disease, disorder, or condition is Type 1 diabetes.
- the beta cell defective disease, disorder, or condition is Type 2 diabetes.
- the beta cell defective disease, disorder, or condition is a metabolic disease.
- one or more symptoms are prevented or treated.
- the subject has an increase in serum glucagon, serum insulin, and/or C-peptide following the administration of a GCGR-binding protein described herein.
- the subject has a decrease in blood glucose (e.g. , whole blood, serum, or plasma glucose) following the administration of a GCGR- binding protein described herein.
- the subject has a decrease in blood glucose and an increase in C-peptide (e.g., serum C-peptide, pancreatic C-peptide, or both).
- a method comprises administering at least one additional therapeutic agent to the subject.
- the additional therapeutic agent is a diabetes or hyperglycemia drug.
- the diabetes or hyperglycemia drug is a biguanide, a sulfonylurea, a meglitinide derivative, an alpha-glucosidase inhibitor, a thiazolidinedione (TZDs), a glucagon-like peptide- 1 (GLP-1) agonist, a dipeptidyl peptidase 4 (DPP-4) inhibitor, a selective sodium-glucose transporter-2 (SGLT-2) inhibitor, an insulin or insulin mimetic, an amylinomimetic, a bile acid sequestrant, and/or a dopamine agonist.
- the additional therapeutic agent is an obesity drug, an appetite suppressant, or a weight loss drug.
- the subject receives a daily dosage of insulin.
- the daily dosage of insulin is decreased following administration of a GCGR-binding protein (e.g. , an antibody).
- an effective amount of a GCGR- binding protein is from about 1 mg/kg to about 100 mg/kg.
- the effective amount is an amount that is about 2-fold to about 10-fold more than the amount needed to decrease the level of blood glucose (e.g. , whole blood, serum or plasma glucose) in the subject.
- the amount is about 2-fold, about 3 -fold, about 4-fold, about 5 -fold, about 6-fold, about 7- fold, about 8-fold, about 9-fold or about 10-fold more than the amount needed to decrease the level of blood glucose in the subject.
- an effective amount of a GCGR- binding protein is administered in four or more doses, such as 4, 5, 6, 7, 8, 9, 10 or more doses, or any interval thereof.
- the effective amount is delivered weekly for four or more weeks, such as about 5 weeks, about 6 weeks, about 8 weeks, about 10 weeks, about 12 weeks, about 4 months, about 5 months, about 6 months, about 1 year, about 2 years or longer, or any interval thereof.
- the effective amount is delivered about once every two weeks, about once every three weeks, or about once every four weeks.
- the amount of binding protein administered is from about 2- fold to about 10-fold higher than the prior dose of antibody. In some embodiments, the prior dose was an individual dose.
- Figures lA- 1 and 1A-2 show sequence alignments of heavy chain variable regions of anti- GCGR antibodies designated 6B5, 3H5, 5B 1 1, 1C1, 1C3, 1H2, 4F8, 13G9, 14F4, and 14E9. Boundaries of CDRs are indicated by Kabat, AbM, Chothia, Contact, and IMGT numbering.
- Figures lB-1 and 1B-2 show sequence alignments of light chain variable regions of anti- GCGR antibodies designated 6B5, 3H5, 5B11, 1C1, 1C3, 1H2, 4F8, 13G9, 14F4, and 14E9. Boundaries of CDRs are indicated by Kabat, AbM, Chothia, Contact, and IMGT numbering.
- Figure 2 depicts a set of representative results from an alanine scanning experiment showing the binding of anti-GCGR antibody 6B5 to 3 GCGR extracellular domain variants comprising single amino acid substitutions.
- Figure 3 depicts the results of an experiment comprising the administration of anti-GCGR antibodies 3H5, 6B5, and 5B11 in a TET-DTA mouse model.
- Figures 4A-4C depict the results of an experiment comprising the administration of anti- GCGR antibodies 3H5, 6B5, and 5B 11 in a TET-DTA mouse model.
- A plasma levels of insulin
- B plasma C-peptide
- C pancreatic insulin content.
- Figures 5A-5C depict the results of an experiment comprising the administration of humanized chimeric anti-GCGR antibody Hz6B5.07mc in a TET-DTA mouse model.
- A blood glucose
- B C- peptide
- C pancreatic insulin content.
- the present disclosure provides proteins that bind glucagon receptors (GCGR).
- the GCGR- binding proteins may include antibodies and may bind a full-length GCGR, a GCGR fragment (e.g., the extracellular domain), and/or a GCGR epitope.
- the binding proteins e.g., antibodies
- the binding proteins may be antagonists that have the capability to (i) inhibit binding of glucagon to GCGR, (ii) inhibit glucagon-induced signaling of GCGR, (iii) inhibit a glucagon/GCGR complex, or (iv) inhibit GCGR signaling.
- the binding proteins (e.g. , antibodies) may be useful in methods for the treatment or prevention of hyperglycemia, diabetes, obesity, and/or beta cell defective diseases, disorders, or conditions, or symptoms thereof.
- the binding proteins e.g., antibodies
- the binding proteins disclosed herein share a common feature of competing with each other for binding to GCGR. This competition suggests that each protein binds to the same region of GCGR (e.g., the same epitope or overlapping epitopes).
- the results described herein suggest that the effects observed for an anti-GCGR antibody derived from or based on antibody 6B5 or an antibody in the 6B5 epitope bin can be extrapolated to other anti-GCGR antibodies having the same or similar epitope specificity.
- the in vitro activities of several exemplary antibodies in Examples 2-4, as well as the in vivo effects of exemplary antibodies in Example 6 are representative of various activities and effects of the anti-GCGR antibodies described herein.
- binding agent refers to a molecule that binds a specific antigen or target (e.g., GCGR).
- a binding agent may comprise a protein, peptide, nucleic acid, carbohydrate, lipid, or small molecular weight compound.
- a binding agent comprises a binding protein.
- a binding agent is a binding protein.
- a binding agent comprises an antibody or an antigen-binding fragment thereof.
- a binding agent is an antibody or an antigen-binding fragment thereof.
- a binding agent comprises an alternative protein scaffold or artificial scaffold and an antigen-binding site comprising CDRs or CDR derivatives.
- a binding agent is a fusion protein comprising an antigen-binding site.
- a binding agent is a bispecific or multispecific molecule comprising at least one antigen-binding site.
- antibody refers to an immunoglobulin molecule that recognizes and binds a target through at least one antigen-binding site.
- Antibody is used herein in the broadest sense and encompasses various antibody structures, including but not limited to, polyclonal antibodies, recombinant antibodies, monoclonal antibodies, chimeric antibodies, humanized antibodies, human antibodies, bispecific antibodies, multispecific antibodies, diabodies, tribodies, tetrabodies, single chain Fv (scFv) antibodies, single domain antibodies (e.g., camelid/llama antibodies), and antibody fragments.
- intact antibody or “full -length antibody” refers to an antibody having a structure substantially similar to a native antibody structure. This includes an antibody comprising two light chains each comprising a variable region and a light chain constant region (CL) and two heavy chains each comprising a variable region and at least heavy chain constant regions CHI, CH2, and CH3.
- CL light chain constant region
- antibody fragment refers to a molecule other than an intact antibody that comprises a portion of an antibody and generally an antigen-binding site.
- antibody fragments include, but are not limited to, Fab, Fab', F(ab')2, Fv, disulfide-linked Fv (sdFv), Fd, linear antibodies, single chain antibody molecules (e.g., scFv), diabodies, tribodies, tetrabodies, minibodies, dual variable domain antibodies (DVD), single variable domain antibodies, and multispecific antibodies formed from antibody fragments.
- variable region refers to the region of an antibody light chain or the region of an antibody heavy chain that is involved in binding the antibody to antigen.
- the variable region of an antibody heavy chain and an antibody light chain have similar structures, and generally comprise four framework regions and three complementarity determining regions (CDRs) (also known as hypervariable regions).
- CDRs complementarity determining regions
- variable region refers to amino acid residues other than the CDR residues within a variable region.
- the variable region generally comprises four framework regions, FR1, FR2, FR3, and FR4.
- the term "monoclonal antibody” as used herein refers to a substantially homogenous antibody population involved in the highly specific recognition and binding of a single antigenic determinant or epitope.
- the individual antibodies comprising the population are identical, except for possible naturally occurring mutations that may be present in minor amounts.
- the term “monoclonal antibody” encompasses intact and full-length monoclonal antibodies as well as antibody fragments (e.g., Fab, Fab', F(ab')2, Fv), single chain (scFv) antibodies, fusion proteins comprising an antibody fragment, and any other modified immunoglobulin molecule comprising an antigen-binding site.
- “monoclonal antibody” refers to such antibodies made by any number of techniques, including but not limited to, hybridoma production, phage library display, recombinant expression, and transgenic animals.
- chimeric antibody refers to an antibody in which a portion of the heavy and/or light chain is derived from a particular source or species, while the remainder of the heavy and/or light chain is derived from a different source or species.
- humanized antibody refers to a chimeric antibody that generally comprises human immunoglobulins (e.g., recipient antibody) in which the native CDR residues are replaced by residues from corresponding CDRs from a nonhuman species (e.g., donor antibody) such as mouse, rat, rabbit, or nonhuman primate, wherein the donor antibody has the desired specificity, affinity, and/or activity.
- a nonhuman species e.g., donor antibody
- humanized antibodies can comprise residues that are not found in the recipient antibody or in the donor antibody. These modifications may be made to further refine and/or optimize antibody characteristics.
- a humanized antibody may comprise variable regions containing all or substantially all of the CDRs that correspond to those of a nonhuman immunoglobulin and all or substantially all of the framework regions that correspond to those of a human immunoglobulin.
- the humanized antibody will comprise at least a portion of an immunoglobulin Fc region (e.g., hinge region, CHI, CH2, and/or CH3), typically that of a human immunoglobulin.
- the term "human antibody” as used herein refers to an antibody that possesses an amino acid sequence that corresponds to an antibody produced by a human and/or an antibody that has been made using any of the techniques that are known to those of skill in the art for making human antibodies. These techniques include, but not limited to, phage display libraries, yeast display libraries, transgenic animals, and B-cell hybridoma technology.
- a human antibody as defined herein excludes a humanized antibody comprising residues from a non-human source.
- epitopes and “antigenic determinant” are used interchangeably herein and refer to that portion of an antigen or target capable of being recognized and bound by a particular binding agent or binding protein (e.g., an antibody).
- a particular binding agent or binding protein e.g., an antibody.
- epitopes formed from contiguous amino acids also referred to as linear epitopes
- epitopes formed by tertiary folding also referred to as conformational epitopes
- An epitope typically includes at least 3, and more usually, at least 5, 6, 7, or 8- 10 amino acids in a unique spatial conformation.
- Epitopes can be predicted using any one of a large number of software bioinformatic tools available on the internet.
- X- ray crystallography may be used to characterize an epitope on a target protein by analyzing the amino acid residue interactions of an antigen/antibody complex.
- a binding protein e.g. , an antibody
- a protein e.g., an antibody
- an antigen e.g., human GCGR
- a related antigen e.g., cyno GCGR
- An antibody that specifically binds an antigen can be identified, for example, by immunoassays, ELISAs, Biacore assays, FACS, or other techniques known to those of ordinary skill in the art.
- polypeptide and “peptide” and “protein” are used interchangeably herein and refer to polymers of amino acids of any length.
- the polymer may be linear or branched, it may comprise modified amino acids, and it may be interrupted by non-amino acids.
- the terms also encompass an amino acid polymer that has been modified naturally or by intervention; for example, disulfide bond formation, glycosylation, lipidation, acetylation, phosphorylation, or any other manipulation or modification.
- polypeptides containing one or more analogs of an amino acid including but not limited to, unnatural amino acids, as well as other modifications known in the art.
- polypeptide encompasses polypeptides as a single chain and polypeptides of two or more associated chains.
- polynucleotide and nucleic acid and nucleic acid molecule are used interchangeably herein and refer to polymers of nucleotides of any length, and include DNA and RNA.
- the nucleotides can be deoxyribonucleotides, ribonucleotides, modified nucleotides or bases, and/or their analogs, or any substrate that can be incorporated into a polymer by DNA or RNA polymerase.
- nucleic acids or polypeptides refer to two or more sequences or subsequences that are the same or have a specified percentage of nucleotides or amino acid residues that are the same, when compared and aligned
- sequence identity may be measured using sequence comparison software or algorithms or by visual inspection.
- Various algorithms and software that may be used to obtain alignments of amino acid or nucleotide sequences are well-known in the art. These include, but are not limited to, BLAST, ALIGN, Megalign, BestFit, GCG Wisconsin Package, and variants thereof.
- two polynucleotides or polypeptides of the disclosure are substantially identical, meaning they have at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, and in some embodiments at least 95%, 96%, 97%, 98%, 99% nucleotide or amino acid residue identity, when compared and aligned for maximum correspondence, as measured using a sequence comparison algorithm or by visual inspection.
- identity exists over a region of the sequences that is at least about 10, at least about 20, at least about 40-60 nucleotides or amino acid residues, at least about 60-80 nucleotides or amino acid residues in length, or any integral value there between.
- identity exists over a longer region than 60-80 nucleotides or amino acid residues, such as at least about 80- 100 nucleotides or amino acid residues, and in some embodiments the sequences are substantially identical over the full length of the sequences being compared, for example, (i) the coding region of a nucleotide sequence or (ii) an amino acid sequence.
- conservative amino acid substitution refers to a substitution in which one amino acid residue is replaced with another amino acid residue having a similar side chain.
- Families of amino acid residues having similar side chains have been generally defined in the art, including basic side chains (e.g. , lysine, arginine, histidine), acidic side chains (e.g., aspartic acid, glutamic acid), uncharged polar side chains (e.g. , glycine, asparagine, glutamine, serine, threonine, tyrosine, cysteine), nonpolar side chains (e.g.
- substitution of a phenylalanine for a tyrosine is considered to be a conservative substitution.
- conservative substitutions in the sequences of polypeptides and/or antibodies do not abrogate the binding of the polypeptide or antibody to the target binding site.
- vector means a construct, which is capable of delivering, and usually expressing, one or more gene(s) or sequence(s) of interest in a host cell.
- vectors include, but are not limited to, viral vectors, naked DNA or RNA expression vectors, plasmid, cosmid, or phage vectors, DNA or RNA expression vectors associated with cationic condensing agents, and DNA or RNA expression vectors encapsulated in liposomes.
- isolated refers to a polypeptide, soluble protein, antibody, polynucleotide, vector, cell, or composition that is in a form not found in nature.
- An "isolated” antibody is substantially free of material from the cellular source from which it is derived.
- isolated polypeptides, soluble proteins, antibodies, polynucleotides, vectors, cells, or compositions are those which have been purified to a degree that they are no longer in a form in which they are found in nature.
- a polypeptide, soluble protein, antibody, polynucleotide, vector, cell, or composition that is isolated is substantially pure.
- polynucleotide, vector, cell, or composition may be isolated from a natural source or from a source such as an engineered cell line.
- substantially pure refers to material which is at least 50% pure (i.e. , free from contaminants), at least 90% pure, at least 95% pure, at least 98% pure, or at least 99% pure.
- subject refers to any animal (e.g. , a mammal), including, but not limited to, humans, non-human primates, canines, felines, rabbits, rodents, and the like, which is to be the recipient of a treatment or therapy.
- animal e.g. , a mammal
- canines e.g., human monocytes
- felines e.g., felines
- rabbits e.g., rabbits, rodents, and the like
- rodents e.g., a mammal
- pharmaceutically acceptable refers to a substance approved or appro vable by a regulatory agency or listed in the U.S. Pharmacopeia, European Pharmacopeia, or other generally recognized pharmacopeia for use in animals, including humans.
- pharmaceutically acceptable excipient, carrier, or adjuvant refers to an excipient, carrier, or adjuvant that can be administered to a subject, together with at least one therapeutic agent (e.g. , an antibody), and which does not have an effect on the pharmacological activity of the therapeutic agent.
- therapeutic agent e.g. , an antibody
- those of skill in the art and the U.S. FDA consider a pharmaceutically acceptable excipient, carrier, or adjuvant to be an inactive ingredient of any formulation.
- pharmaceutical formulation or “pharmaceutical composition” as used herein refers to a preparation that is in such form as to permit the biological activity of the agent (e.g., an antibody) to be effective.
- a pharmaceutical formulation or composition generally comprises additional components, such as a pharmaceutically acceptable excipient, carrier, adjuvant, buffers, etc.
- the term "effective amount” or “therapeutically effective amount” as used herein refers to the amount of a binding protein (e.g., an antibody) which is sufficient to reduce and/or ameliorate the severity and/or duration of a disease, disorder or condition and/or a symptom in a subject.
- the term also encompasses an amount of a binding protein necessary for the (i) reduction or amelioration of the advancement or progression of a given disease, disorder, or condition, (ii) reduction or amelioration of the recurrence, development, or onset of a given disease, disorder, or condition, and/or (iii) the improvement or enhancement of the prophylactic or therapeutic effect(s) of another agent or therapy (e.g., an agent other than the binding proteins provided herein).
- another agent or therapy e.g., an agent other than the binding proteins provided herein.
- a binding protein e.g., an antibody
- the term also encompasses the ability of a binding protein to (i) reduce or ameliorate the advancement or progression of a given disease, disorder, or condition, (ii) reduce or ameliorate the recurrence, development, or onset of a given disease, disorder, or condition, and/or (iii) to improve or enhance the prophylactic or therapeutic effect(s) of another agent or therapy (e.g., an agent other than the binding proteins provided herein).
- treat or “treatment” or “treating” or “to treat” or “alleviate” or “alleviation” or “alleviating” or “to alleviate” as used herein refers to both (1) therapeutic measures that aim to cure, slow down, lessen symptoms of, and/or halt progression of a pathologic condition or disorder and (2) prophylactic or preventative measures that aim to prevent or slow down the development of a targeted pathologic condition or disorder.
- those in need of treatment include those already with the disorder, those at risk of having/developing the disorder, and those in whom the disorder is to be prevented.
- prevent refers to the partial or total inhibition of the development, recurrence, onset, or spread of a disease, disorder, or condition, or a symptom thereof in a subject.
- prophylactic agent refers to an agent that partially or totally inhibits the development, recurrence, onset, or spread of a disease, disorder or condition, or a symptom thereof in a subject.
- Amino acid (aa) sequences for human GCGR e.g., UniProtKB No. P47871
- cynomolgus (“cyno") monkey GCGR e.g., NCBI Ref. No. XP_005585314.1
- mouse GCGR e.g. , UniProtKB No. Q61606
- rat GCGR e.g. , UniProtKB No. P30082
- SEQ ID NO:222, SEQ ID NO:227, SEQ ID NO:228, and SEQ ID NO:229 are known to those of skill in the art and representative sequences are provided herein as SEQ ID NO:222, SEQ ID NO:227, SEQ ID NO:228, and SEQ ID NO:229, respectively.
- reference to amino acid positions of GCGR refer to the numbering of amino acid sequences including the signal sequence.
- the agents that bind GCGR are proteins. Generally, these proteins are referred to herein as "GCGR- binding proteins".
- a GCGR-binding protein specifically binds a fragment of GCGR.
- a GCGR-binding protein specifically binds the extracellular domain of GCGR.
- a GCGR-binding protein specifically binds a portion or fragment of the extracellular domain of GCGR.
- a GCGR-binding protein specifically binds an epitope on GCGR.
- a GCGR-binding protein specifically binds human GCGR.
- a GCGR-binding protein specifically binds cyno GCGR. In some embodiments, a GCGR-binding protein specifically binds human GCGR and cyno GCGR. In some embodiments, a GCGR-binding protein specifically binds mouse GCGR.
- Non-limiting examples of GCGR-binding proteins can be found in U.S. Patent Publication Nos. 2009/0041784, 2009/0252727, 2012/0128679; 2014/0335091, and International Publication No. WO 201 1/030935.
- the GCGR-binding protein binds within amino acids 26-136 of human GCGR. In some embodiments, the GCGR-binding protein binds within amino acids 28-123 of human GCGR. In some embodiments, the GCGR-binding protein binds within amino acids 80-1 19 of human GCGR. [0084] In some embodiments, the GCGR-binding protein binds within amino acids 26-136 of SEQ ID NO:222. In some embodiments, the GCGR-binding protein binds within amino acids 28-123 of SEQ ID NO:222. In some embodiments, the GCGR-binding protein binds within amino acids 80-1 19 of SEQ ID NO:222.
- the GCGR-binding protein binds within SEQ ID NO:224. In some embodiments, the GCGR-binding protein binds within SEQ ID NO: 225. In some embodiments, the GCGR-binding protein binds within SEQ ID NO: 226.
- the GCGR-binding protein (e.g. , an antibody) binds an epitope comprising at least one of L38, L85, R94, and W106 of SEQ ID NO:222. In some embodiments, the GCGR-binding protein (e.g., an antibody) binds an epitope that does not comprise Y84, W106, and/or Ri l l of SEQ ID NO:222.
- the GCGR-binding protein is an antibody.
- the antibody is a recombinant antibody.
- the antibody is a monoclonal antibody.
- the antibody is a chimeric antibody.
- the antibody is a humanized antibody.
- the antibody is a human antibody.
- the antibody is an IgA, IgD, IgE, IgG, or IgM antibody.
- the antibody is an IgGl antibody.
- the antibody is an IgG2 antibody.
- the antibody is an IgG4 antibody.
- the antibody is an antibody fragment comprising an antigen- binding site.
- the antibody is a bispecific antibody or a multispecific antibody.
- the antibody is a monovalent antibody.
- the antibody is a monospecific antibody.
- the antibody is a bivalent antibody.
- the antibody is isolated. In some embodiments, the antibody is substantially pure.
- the GCGR-binding proteins are polyclonal antibodies.
- Polyclonal antibodies can be prepared by any known method.
- polyclonal antibodies are produced by immunizing an animal (e.g., a rabbit, rat, mouse, goat, donkey) with an antigen of interest (e.g., a purified peptide fragment, a recombinant protein, or a fusion protein) using multiple subcutaneous or intraperitoneal injections.
- the antigen is conjugated to a carrier such as keyhole limpet hemocyanin (KLH), serum albumin, bovine thyroglobulin, or soybean trypsin inhibitor.
- KLH keyhole limpet hemocyanin
- the antigen (with or without a carrier protein) is diluted in sterile saline and usually combined with an adjuvant (e.g., Complete or Incomplete Freund's Adjuvant) to form a stable emulsion.
- an adjuvant e.g., Complete or Incomplete Freund's Adjuvant
- polyclonal antibodies are recovered from the immunized animal, usually from blood or ascites.
- the polyclonal antibodies can be purified from serum or ascites according to standard methods in the art including, but not limited to, affinity chromatography, ion-exchange chromatography, gel electrophoresis, and dialysis.
- a GCGR-binding protein is a monoclonal antibody.
- monoclonal antibodies are prepared using hybridoma methods known to one of skill in the art. For example, using the hybridoma method, a mouse, rat, rabbit, hamster, or other appropriate host animal, is immunized as described above to elicit the production of antibodies. In some embodiments, lymphocytes are immunized in vitro. In some embodiments, the immunizing antigen is a human protein or a fragment thereof. In some embodiments, the immunizing antigen is a mouse protein or a fragment thereof.
- lymphocytes are isolated and fused with a suitable myeloma cell line using, for example, polyethylene glycol.
- the hybridoma cells are selected using specialized media as known in the art and unfused lymphocytes and myeloma cells do not survive the selection process.
- Hybridomas that produce monoclonal antibodies directed specifically against a chosen antigen can be identified by a variety of screening methods including, but not limited to, immunoprecipitation, immunoblotting, and in vitro binding assays (e.g. , flow cytometry, FACS, ELISA, Biacore, and radioimmunoassay).
- the clones may be subcloned by limiting dilution techniques.
- the hybridomas can be propagated either in in vitro culture using standard methods or in vivo as ascites tumors in an animal.
- the monoclonal antibodies can be purified from the culture medium or ascites fluid according to standard methods in the art including, but not limited to, affinity chromatography, ion- exchange chromatography, gel electrophoresis, and dialysis.
- monoclonal antibodies are made using recombinant DNA techniques as known to one skilled in the art.
- the polynucleotides encoding a monoclonal antibody are isolated from mature B-cells or hybridoma cells, such as by RT-PCR using oligonucleotide primers that specifically amplify the genes encoding the heavy and light chains of the antibody, and their sequence is determined using standard techniques.
- the isolated polynucleotides encoding the heavy and light chains are then cloned into suitable expression vectors which produce the monoclonal antibodies when transfected into host cells such as E. coli, simian COS cells, Chinese hamster ovary (CHO) cells, or myeloma cells that do not otherwise produce immunoglobulin proteins.
- recombinant monoclonal antibodies, or fragments thereof are isolated from phage display libraries expressing variable domains or CDRs of a desired species. Screening of phage libraries can be accomplished by various techniques known in the art.
- a monoclonal antibody is modified, for example, by using recombinant DNA technology to generate alternative antibodies.
- the constant domains of the light chain and heavy chain of a mouse monoclonal antibody are substituted for constant regions of a human antibody to generate a chimeric antibody, or for a non-immunoglobulin polypeptide to generate a fusion antibody.
- the constant regions are truncated or removed to generate a desired antibody fragment of a monoclonal antibody. Site-directed or high-density mutagenesis of the variable region(s) can be used to optimize, for example, specificity and affinity of a monoclonal antibody.
- a GCGR-binding protein is a humanized antibody.
- a human antibody comprises one or more amino acid residues that have been introduced into it from a source that is non- human. These non-human amino acid residues are often referred to as "donor" residues, which are typically taken from a "donor” variable domain.
- humanization is performed by substituting one or more non-human CDR sequences for the corresponding CDR sequences of a human antibody.
- the humanized antibodies are constructed by CDR grafting, in which the amino acid sequences of all six CDRs of the parent non-human antibody (e.g., rodent) are grafted into a human antibody heavy and light chain variable region sequences.
- the parent non-human antibody e.g., rodent
- variable region sequence for the humanized antibody.
- a method is used wherein a particular variable region sequence derived from a consensus sequence of all human antibodies of a particular subgroup of light or heavy chains is selected.
- the variable region sequence is derived from the consensus sequences of the most abundant human subclasses.
- human germline genes are used as the source of the variable region sequences.
- HSC Human String Content
- a GCGR-binding protein is a human antibody.
- Human antibodies can be directly prepared using various techniques known in the art.
- human antibodies are generated from immortalized human B lymphocytes immunized in vitro.
- human antibodies are generated from lymphocytes isolated from an immunized individual. In any case, cells that produce an antibody directed against a target antigen can be generated and isolated.
- a human antibody is selected from a phage library, where that phage library expresses human antibodies.
- phage display technology may be used to produce human antibodies and antibody fragments in vitro, for example, from immunoglobulin variable region gene repertoires from unimmunized donors.
- human antibodies are produced in transgenic mice that contain human immunoglobulin loci. Upon immunization these mice are capable of producing the full repertoire of human antibodies in the absence of endogenous immunoglobulin production.
- a GCGR-binding protein is a bispecific antibody.
- Bispecific antibodies are capable of recognizing and binding at least two different antigens or epitopes. The different epitopes can either be within the same molecule (e.g., two epitopes on GCGR) or on different molecules (e.g. , one epitope on GCGR and one epitope on a different target).
- a bispecific antibody has enhanced potency as compared to an individual antibody or to a combination of more than one antibody.
- a bispecific antibody has reduced toxicity as compared to an individual antibody or to a combination of more than one antibody.
- a bispecific antibody has the ability to synchronize the PK of two active binding agents wherein the two individual binding agents have different PK profiles.
- a bispecific antibody has the ability to concentrate the actions of two agents in a common area (e.g. , tissue) in a subject.
- a bispecific antibody has the ability to concentrate the actions of two agents to a common target (e.g., a specific cell type).
- a bispecific antibody has the ability to target the actions of two agents to more than one biological pathway or function.
- a bispecific antibody has the ability to target two different cells and bring them closer together.
- a bispecific antibody has decreased toxicity and/or side effects. In some embodiments, a bispecific antibody has decreased toxicity and/or side effects as compared to a mixture of the two individual antibodies or the antibodies as single agents. In some embodiments, a bispecific antibody has an increased therapeutic index. In some embodiments, a bispecific antibody has an increased therapeutic index as compared to a mixture of the two individual antibodies or the antibodies as single agents.
- the bispecific antibodies comprise heavy chain constant regions with modifications in the amino acids which are part of the interface between the two heavy chains.
- the bispecific antibodies are generated using a knobs-into-holes (KIH) strategy.
- the bispecific antibodies comprise variant hinge regions incapable of forming disulfide linkages between the heavy chains.
- the bispecific antibodies comprise heavy chains with changes in amino acids that result in altered electrostatic interactions.
- the bispecific antibodies comprise heavy chains with changes in amino acids that result in altered
- Bispecific antibodies can be intact antibodies or antibody fragments comprising antigen-binding sites.
- Antibodies with more than two valencies are also contemplated.
- trispecific or tetraspecific antibodies can be prepared.
- the antibodies to GCGR are multispecific.
- a GCGR-binding protein is an antibody that binds GCGR. In some embodiments, the GCGR-binding protein is an antibody that binds human GCGR. In some embodiments, the GCGR-binding protein is an antibody that binds cyno GCGR. In some embodiments, the GCGR- binding protein is an antibody that binds human and cyno GCGR. In some embodiments, the GCGR- binding protein is an antibody that binds mouse GCGR. In some embodiments, the GCGR-binding protein is an antibody that binds a portion or fragment of GCGR.
- the GCGR- binding protein is an antibody that binds the extracellular domain of GCGR. In some embodiments, the GCGR-binding protein is an antibody that binds a fragment or portion of the extracellular domain of GCGR. In some embodiments, the GCGR-binding protein is an antibody that binds a GCGR epitope. In some embodiments, the GCGR epitope is a linear epitope. In some embodiments, the GCGR epitope is a conformational epitope.
- the GCGR-binding protein is an antibody that comprises one, two, three, four, five, and/or six CDRs of any one of the antibodies described herein.
- an anti- GCGR antibody comprises (i) one, two, and/or three heavy chain CDRs from Tables 1-10, and/or (ii) one, two, and/or three light chain CDRs from Tables 1-10.
- CDRs are defined by a variety of methods/systems by those skilled in the art. These systems and/or definitions have been developed and refined over a number of years and include Kabat, Chothia, IMGT, AbM, and "Contact". The Kabat definition is based on sequence variability and generally is the most commonly used.
- the Chothia definition is based on the location of the structural loop regions.
- the IMGT system is based on sequence variability and location within the structure of the variable domain.
- the AbM definition is a compromise between Kabat and Chothia.
- the "Contact” definition is based on analyses of the available antibody crystal structures.
- An Exemplary system, as included in Tables 1- 10, is a combination of Kabat and Chothia.
- a GCGR-binding protein (e.g., an antibody) comprises the Exemplary heavy chain CDR1, CDR2, and CDR3 and the Exemplary light chain CDR1, CDR2, and CDR3 from Table 1.
- a GCGR-binding protein (e.g., an antibody) comprises the Kabat heavy chain CDR1, CDR2, and CDR3 and the Kabat light chain CDR1, CDR2, and CDR3 from Table 1.
- a GCGR-binding protein (e.g. , an antibody) comprises the Chothia heavy chain CDRl, CDR2, and CDR3 and the Chothia light chain CDRl, CDR2, and CDR3 from Table 1.
- a GCGR-binding protein (e.g. , an antibody) comprises the IMGT heavy chain CDRl, CDR2, and CDR3 and the IMGT light chain CDRl, CDR2, and CDR3 from Table 1.
- a GCGR-binding protein (e.g. , an antibody) comprises the Contact heavy chain CDRl, CDR2, and CDR3 and the Contact light chain CDRl, CDR2, and CDR3 from Table 1.
- a GCGR-binding protein (e.g. , an antibody) comprises the AbM heavy chain CDRl, CDR2, and CDR3 and the AbM light chain CDRl, CDR2, and CDR3 from Table 1.
- a GCGR-binding protein (e.g., an antibody) comprises the Exemplary heavy chain CDRl, CDR2, and CDR3 and the Exemplary light chain CDRl, CDR2, and CDR3 from Table 2.
- a GCGR-binding protein (e.g., an antibody) comprises the Kabat heavy chain CDRl, CDR2, and CDR3 and the Kabat light chain CDRl, CDR2, and CDR3 from Table 2.
- a GCGR-binding protein (e.g. , an antibody) comprises the Chothia heavy chain CDRl, CDR2, and CDR3 and the Chothia light chain CDRl, CDR2, and CDR3 from Table 2.
- a GCGR-binding protein (e.g. , an antibody) comprises the IMGT heavy chain CDRl, CDR2, and CDR3 and the IMGT light chain CDRl, CDR2, and CDR3 from Table 2.
- a GCGR-binding protein (e.g. , an antibody) comprises the Contact heavy chain CDRl, CDR2, and CDR3 and the Contact light chain CDRl, CDR2, and CDR3 from Table 2.
- a GCGR-binding protein (e.g. , an antibody) comprises the AbM heavy chain CDRl, CDR2, and CDR3 and the AbM light chain CDRl, CDR2, and CDR3 from Table 2.
- a GCGR-binding protein (e.g., an antibody) comprises the Exemplary heavy chain CDRl, CDR2, and CDR3 and the Exemplary light chain CDRl, CDR2, and CDR3 from Table 3.
- a GCGR-binding protein (e.g., an antibody) comprises the Kabat heavy chain CDRl, CDR2, and CDR3 and the Kabat light chain CDRl, CDR2, and CDR3 from Table 3.
- a GCGR-binding protein (e.g. , an antibody) comprises the Chothia heavy chain CDRl, CDR2, and CDR3 and the Chothia light chain CDRl, CDR2, and CDR3 from Table 3.
- a GCGR-binding protein (e.g. , an antibody) comprises the IMGT heavy chain CDRl, CDR2, and CDR3 and the IMGT light chain CDRl, CDR2, and CDR3 from Table 3.
- a GCGR-binding protein (e.g. , an antibody) comprises the IMGT heavy chain CDRl, CDR2, and CDR3 and the IMGT light chain CDRl, CDR2, and CDR3 from Table 3.
- a GCGR-binding protein (e.g. , an antibody) comprises the Contact heavy chain CDRl, CDR2, and CDR3 and the Contact light chain CDRl, CDR2, and CDR3 from Table 3.
- a GCGR-binding protein (e.g. , an antibody) comprises the AbM heavy chain CDRl, CDR2, and CDR3 and the AbM light chain CDRl, CDR2, and CDR3 from Table 3.
- a GCGR-binding protein (e.g., an antibody) comprises the Exemplary heavy chain CDR1, CDR2, and CDR3 and the Exemplary light chain CDR1, CDR2, and CDR3 from Table 4.
- a GCGR-binding protein (e.g., an antibody) comprises the Kabat heavy chain CDR1, CDR2, and CDR3 and the Kabat light chain CDR1, CDR2, and CDR3 from Table 4.
- a GCGR-binding protein (e.g. , an antibody) comprises the Chothia heavy chain CDR1, CDR2, and CDR3 and the Chothia light chain CDR1, CDR2, and CDR3 from Table 4.
- a GCGR-binding protein (e.g. , an antibody) comprises the IMGT heavy chain CDR1, CDR2, and CDR3 and the IMGT light chain CDR1, CDR2, and CDR3 from Table 4.
- a GCGR-binding protein (e.g. , an antibody) comprises the Contact heavy chain CDR1, CDR2, and CDR3 and the Contact light chain CDR1, CDR2, and CDR3 from Table 4.
- a GCGR-binding protein (e.g. , an antibody) comprises the AbM heavy chain CDR1, CDR2, and CDR3 and the AbM light chain CDR1, CDR2, and CDR3 from Table 4.
- a GCGR-binding protein (e.g., an antibody) comprises the Exemplary heavy chain CDR1, CDR2, and CDR3 and the Exemplary light chain CDR1, CDR2, and CDR3 from Table 5.
- a GCGR-binding protein (e.g., an antibody) comprises the Kabat heavy chain CDR1, CDR2, and CDR3 and the Kabat light chain CDR1, CDR2, and CDR3 from Table 5.
- a GCGR-binding protein (e.g. , an antibody) comprises the Chothia heavy chain CDR1, CDR2, and CDR3 and the Chothia light chain CDR1, CDR2, and CDR3 from Table 5.
- a GCGR-binding protein (e.g. , an antibody) comprises the IMGT heavy chain CDR1, CDR2, and CDR3 and the IMGT light chain CDR1, CDR2, and CDR3 from Table 5.
- a GCGR-binding protein (e.g. , an antibody) comprises the Contact heavy chain CDR1, CDR2, and CDR3 and the Contact light chain CDR1, CDR2, and CDR3 from Table 5.
- a GCGR-binding protein (e.g. , an antibody) comprises the AbM heavy chain CDR1, CDR2, and CDR3 and the AbM light chain CDR1, CDR2, and CDR3 from Table 5.
- a GCGR-binding protein (e.g., an antibody) comprises the Exemplary heavy chain CDR1, CDR2, and CDR3 and the Exemplary light chain CDR1, CDR2, and CDR3 from Table 6.
- a GCGR-binding protein (e.g., an antibody) comprises the Kabat heavy chain CDR1, CDR2, and CDR3 and the Kabat light chain CDR1, CDR2, and CDR3 from Table 6.
- a GCGR-binding protein (e.g. , an antibody) comprises the Chothia heavy chain CDR1, CDR2, and CDR3 and the Chothia light chain CDR1, CDR2, and CDR3 from Table 6.
- a GCGR-binding protein (e.g. , an antibody) comprises the IMGT heavy chain CDR1, CDR2, and CDR3 and the IMGT light chain CDR1, CDR2, and CDR3 from Table 6.
- a GCGR-binding protein (e.g. , an antibody) comprises the Contact heavy chain CDR1, CDR2, and CDR3 and the Contact light chain CDR1, CDR2, and CDR3 from Table 6.
- a GCGR-binding protein (e.g. , an antibody) comprises the AbM heavy chain CDR1, CDR2, and CDR3 and the AbM light chain CDR1, CDR2, and CDR3 from Table 6.
- a GCGR-binding protein (e.g., an antibody) comprises the Exemplary heavy chain CDR1, CDR2, and CDR3 and the Exemplary light chain CDR1, CDR2, and CDR3 from Table 7.
- a GCGR-binding protein (e.g., an antibody) comprises the Kabat heavy chain CDR1, CDR2, and CDR3 and the Kabat light chain CDR1, CDR2, and CDR3 from Table 7.
- a GCGR-binding protein (e.g. , an antibody) comprises the Chothia heavy chain CDR1, CDR2, and CDR3 and the Chothia light chain CDR1, CDR2, and CDR3 from Table 7.
- a GCGR-binding protein (e.g. , an antibody) comprises the IMGT heavy chain CDR1, CDR2, and CDR3 and the IMGT light chain CDR1, CDR2, and CDR3 from Table 7.
- a GCGR-binding protein (e.g. , an antibody) comprises the Contact heavy chain CDR1, CDR2, and CDR3 and the Contact light chain CDR1, CDR2, and CDR3 from Table 7.
- a GCGR-binding protein (e.g. , an antibody) comprises the AbM heavy chain CDR1, CDR2, and CDR3 and the AbM light chain CDR1, CDR2, and CDR3 from Table 7.
- a GCGR-binding protein (e.g., an antibody) comprises the Exemplary heavy chain CDR1, CDR2, and CDR3 and the Exemplary light chain CDR1, CDR2, and CDR3 from Table 8.
- a GCGR-binding protein (e.g., an antibody) comprises the Kabat heavy chain CDR1, CDR2, and CDR3 and the Kabat light chain CDR1, CDR2, and CDR3 from Table 8.
- a GCGR-binding protein (e.g. , an antibody) comprises the Chothia heavy chain CDR1, CDR2, and CDR3 and the Chothia light chain CDR1, CDR2, and CDR3 from Table 8.
- a GCGR-binding protein (e.g. , an antibody) comprises the IMGT heavy chain CDR1, CDR2, and CDR3 and the IMGT light chain CDR1, CDR2, and CDR3 from Table 8.
- a GCGR-binding protein (e.g. , an antibody) comprises the Contact heavy chain CDR1, CDR2, and CDR3 and the Contact light chain CDR1, CDR2, and CDR3 from Table 8.
- a GCGR-binding protein (e.g. , an antibody) comprises the AbM heavy chain CDR1, CDR2, and CDR3 and the AbM light chain CDR1, CDR2, and CDR3 from Table 8.
- a GCGR-binding protein (e.g., an antibody) comprises the Exemplary heavy chain CDR1, CDR2, and CDR3 and the Exemplary light chain CDR1, CDR2, and CDR3 from Table 9.
- a GCGR-binding protein (e.g., an antibody) comprises the Kabat heavy chain CDR1, CDR2, and CDR3 and the Kabat light chain CDR1, CDR2, and CDR3 from Table 9.
- a GCGR-binding protein (e.g. , an antibody) comprises the Chothia heavy chain CDR1, CDR2, and CDR3 and the Chothia light chain CDR1, CDR2, and CDR3 from Table 9.
- a GCGR-binding protein (e.g. , an antibody) comprises the IMGT heavy chain CDR1, CDR2, and CDR3 and the IMGT light chain CDR1, CDR2, and CDR3 from Table 9.
- a GCGR-binding protein (e.g. , an antibody) comprises the Contact heavy chain CDRl, CDR2, and CDR3 and the Contact light chain CDRl, CDR2, and CDR3 from Table 9.
- a GCGR-binding protein (e.g. , an antibody) comprises the AbM heavy chain CDRl, CDR2, and CDR3 and the AbM light chain CDRl, CDR2, and CDR3 from Table 9.
- a GCGR-binding protein (e.g., an antibody) comprises the Exemplary heavy chain CDRl, CDR2, and CDR3 and the Exemplary light chain CDRl, CDR2, and CDR3 from Table 10.
- a GCGR-binding protein (e.g. , an antibody) comprises the Kabat heavy chain CDRl, CDR2, and CDR3 and the Kabat light chain CDRl, CDR2, and CDR3 from Table 10.
- a GCGR-binding protein (e.g. , an antibody) comprises the Chothia heavy chain CDRl, CDR2, and CDR3 and the Chothia light chain CDRl, CDR2, and CDR3 from Table 10.
- a GCGR-binding protein (e.g. , an antibody) comprises the IMGT heavy chain CDRl, CDR2, and CDR3 and the IMGT light chain CDRl, CDR2, and CDR3 from Table 10.
- a GCGR-binding protein (e.g. , an antibody) comprises the Contact heavy chain CDRl, CDR2, and CDR3 and the Contact light chain CDRl, CDR2, and CDR3 from Table 10.
- a GCGR-binding protein (e.g. , an antibody) comprises the AbM heavy chain CDRl, CDR2, and CDR3 and the AbM light chain CDRl, CDR2, and CDR3 from Table 10.
- a GCGR-binding protein (e.g. , an antibody) comprises a CDRl, CDR2, and CDR3 and a light chain CDRl, CDR2, CDR3 from the antibody designated 6B5.
- a GCGR-binding protein (e.g. , an antibody) comprises a CDRl, CDR2, and CDR3 and a light chain CDRl, CDR2, CDR3 from the antibody designated 3H5.
- a GCGR- binding protein (e.g. , an antibody) comprises a CDRl , CDR2, and CDR3 and a light chain CDRl, CDR2, CDR3 from the antibody designated 5B 1 1.
- a GCGR-binding protein (e.g., an antibody) comprises a CDRl, CDR2, and CDR3 and a light chain CDRl, CDR2, CDR3 from the antibody designated 1C1.
- a GCGR-binding protein (e.g. , an antibody) comprises a CDRl, CDR2, and CDR3 and a light chain CDRl, CDR2, CDR3 from the antibody designated 1C3.
- a GCGR-binding protein (e.g. , an antibody) comprises a CDRl, CDR2, and CDR3 and a light chain CDRl, CDR2, CDR3 from the antibody designated 1H2.
- a GCGR-binding protein (e.g., an antibody) comprises a CDRl, CDR2, and CDR3 and a light chain CDRl, CDR2, CDR3 from the antibody designated 4F8.
- a GCGR-binding protein (e.g., an antibody) comprises a CDRl, CDR2, and CDR3 and a light chain CDRl, CDR2, CDR3 from the antibody designated 13G9.
- a GCGR-binding protein (e.g., an antibody) comprises a CDRl, CDR2, and CDR3 and a light chain CDRl, CDR2, CDR3 from the antibody designated 14F4.
- a GCGR-binding protein (e.g. , an antibody) comprises a CDRl, CDR2, and CDR3 and a light chain CDRl, CDR2, CDR3 from the antibody designated 14E9.
- Table 1 Antibody 6B5 Sequences
- a GCGR-binding protein (e.g., an antibody) comprises (a) a heavy chain CDRl comprising SEQ ID NOs: 1, 7, 12, 13, or 18; a heavy chain CDR2 comprising SEQ ID NOs:2, 8, 14, 19, or 24; and a heavy chain CDR3 comprising SEQ ID NOs:3, 9, 15, or 20; and/or (b) a light chain CDRl comprising SEQ ID NOs: 4, 10, 16, or 21 ; a light chain CDR2 comprising SEQ ID NOs: 5, 1 1, or 22; and a light chain CDR3 comprising SEQ ID NOs:6, 17, or 23.
- a GCGR- binding protein (e.g.
- an antibody comprises a heavy chain CDRl comprising GFTFTNHWLG (SEQ ID NO: 1); a heavy chain CDR2 comprising DIYPGGYYINYNEKFKG (SEQ ID NO:2); and a heavy chain CDR3 comprising HTNYGSDY (SEQ ID NO:3).
- the GCGR-binding protein further comprises a light chain CDRl comprising RSSQSIVDSYGNTFLE (SEQ ID NO:4); a light chain CDR2 comprising KVSNRLS (SEQ ID NO:5); and a light chain CDR3 comprising FQGSHVPWT (SEQ ID NO:6).
- a GCGR-binding protein e.g.
- an antibody comprises a light chain CDRl comprising RSSQSIVDSYGNTFLE (SEQ ID NO:4); a light chain CDR2 comprising KVSNRLS (SEQ ID NO:5); and a light chain CDR3 comprising FQGSHVPWT (SEQ ID NO:6).
- a GCGR-binding protein e.g.
- an antibody comprises a heavy chain CDRl comprising GFTFTNHWLG (SEQ ID NO: 1); a heavy chain CDR2 comprising DIYPGGYYINYNEKFKG (SEQ ID NO:2); a heavy chain CDR3 comprising HTNYGSDY (SEQ ID NO:3); a light chain CDRl comprising RSSQSIVDSYGNTFLE (SEQ ID NO:4); a light chain CDR2 comprising KVSNRLS (SEQ ID NO:5); and a light chain CDR3 comprising FQGSHVPWT (SEQ ID NO:6).
- a GCGR-binding protein (e.g., an antibody) comprises: (a) a heavy chain CDRl comprising GFTFTNHWLG (SEQ ID NO: 1) or a variant thereof comprising 1, 2, 3, or 4 amino acid substitutions; a heavy chain CDR2 comprising DIYPGGYYINYNEKFKG (SEQ ID NO:2) or a variant thereof comprising 1, 2, 3, or 4 amino acid substitutions; a heavy chain CDR3 comprising HTNYGSDY (SEQ ID NO:3) or a variant thereof comprising 1, 2, 3, or 4 amino acid substitutions; a light chain CDRl comprising RSSQSIVDSYGNTFLE (SEQ ID NO:4) or a variant thereof comprising 1, 2, 3, or 4 amino acid substitutions; a light chain CDR2 comprising KVSNRLS (SEQ ID NO:5) or a variant thereof comprising 1, 2, 3, or 4 amino acid substitutions; and a light chain CDR3 comprising FQGSHVPWT (SEQ ID NO:
- the amino acid substitutions are conservative substitutions. In some embodiments, the substitutions are made as part of a humanization process. In some embodiments, the substitutions are made as part of a germline humanization process. In some embodiments, the substitutions are made as part of an affinity maturation process. In some embodiments, the substitutions are made as part of an optimization process.
- a GCGR-binding protein (e.g., an antibody) comprises (a) a heavy chain CDRl comprising SEQ ID NO:7: a heavy chain CDR2 comprising SEQ ID NO: 8; and a heavy chain CDR3 comprising SEQ ID NO:9; and/or (b) a light chain CDRl comprising SEQ ID NO: 10; a light chain CDR2 comprising SEQ ID NO: 1 1 ; and a light chain CDR3 comprising SEQ ID NO: 6.
- a GCGR-binding protein (e.g., an antibody) comprises (a) a heavy chain CDRl comprising SEQ ID NO:7: a heavy chain CDR2 comprising SEQ ID NO: 8; and a heavy chain CDR3 comprising SEQ ID NO:9; and/or (b) a light chain CDRl comprising SEQ ID NO: 10; a light chain CDR2 comprising SEQ ID NO: 1 1 ; and a light chain CDR3 comprising SEQ ID NO
- an antibody comprises (a) a heavy chain CDRl comprising SEQ ID NO: 12: a heavy chain CDR2 comprising SEQ ID NO:2; and a heavy chain CDR3 comprising SEQ ID NO:3; and/or (b) a light chain CDRl comprising SEQ ID NO:4; a light chain CDR2 comprising SEQ ID NO: 5; and a light chain CDR3 comprising SEQ ID NO:6.
- a GCGR- binding protein (e.g., an antibody) comprises (a) a heavy chain CDRl comprising SEQ ID NO: 13 : a heavy chain CDR2 comprising SEQ ID NO: 14; and a heavy chain CDR3 comprising SEQ ID NO: 15; and/or (b) a light chain CDRl comprising SEQ ID NO: 16; a light chain CDR2 comprising SEQ ID NO: 1 1 ; and a light chain CDR3 comprising SEQ ID NO: 17.
- a GCGR-binding protein (e.g., an antibody) comprises (a) a heavy chain CDRl comprising SEQ ID NO: 18: a heavy chain CDR2 comprising SEQ ID NO: 19; and a heavy chain CDR3 comprising SEQ ID NO:20; and/or (b) a light chain CDRl comprising SEQ ID NO:21 ; a light chain CDR2 comprising SEQ ID NO:22; and a light chain CDR3 comprising SEQ ID NO:23.
- a GCGR-binding protein (e.g., an antibody) comprises (a) a heavy chain CDRl comprising SEQ ID NO: 18: a heavy chain CDR2 comprising SEQ ID NO: 19; and a heavy chain CDR3 comprising SEQ ID NO:20; and/or (b) a light chain CDRl comprising SEQ ID NO:21 ; a light chain CDR2 comprising SEQ ID NO:22; and a light chain CDR3 comprising SEQ ID NO:
- an antibody comprises (a) a heavy chain CDRl comprising SEQ ID NO: 1 : a heavy chain CDR2 comprising SEQ ID NO:24; and a heavy chain CDR3 comprising SEQ ID NO:3; and/or (b) a light chain CDRl comprising SEQ ID NO:4; a light chain CDR2 comprising SEQ ID NO:5; and a light chain CDR3 comprising SEQ ID NO:6.
- a GCGR-binding protein comprises a heavy chain CDRl comprising SEQ ID NO: 1, a heavy chain CDR2 comprising SEQ ID NO: 2, and a heavy chain CDR3 comprising SEQ ID NO: 3.
- a GCGR-binding protein comprises a heavy chain CDRl comprising SEQ ID NO:7, a heavy chain CDR2 comprising SEQ ID NO: 8, and a heavy chain CDR3 comprising SEQ ID NO: 9.
- a GCGR-binding protein comprises a heavy chain CDRl comprising SEQ ID NO: 12, a heavy chain CDR2 comprising SEQ ID NO: 2, and a heavy chain CDR3 comprising SEQ ID NO:3.
- a GCGR-binding protein comprises a heavy chain CDRl comprising SEQ ID NO: 13, a heavy chain CDR2 comprising SEQ ID NO: 14, and a heavy chain CDR3 comprising SEQ ID NO: 15.
- a GCGR-binding protein comprises a heavy chain CDRl comprising SEQ ID NO: 18, a heavy chain CDR2 comprising SEQ ID NO: 19, and a heavy chain CDR3 comprising SEQ ID NO:20.
- a GCGR-binding protein comprises a heavy chain CDRl comprising SEQ ID NO: 1, a heavy chain CDR2 comprising SEQ ID NO:24, and a heavy chain CDR3 comprising SEQ ID NO: 3.
- the GCGR-binding protein is an antibody. In some embodiments, the antibody is a humanized antibody. In another embodiment, the GCGR-binding protein is an antigen-binding antibody fragment. [00119] In some embodiments, a GCGR-binding protein comprises a light chain CDRl comprising SEQ ID NO: 4, a light chain CDR2 comprising SEQ ID NO:5, and a light chain CDR3 comprising SEQ ID NO:6. In another embodiment, a GCGR-binding protein comprises a light chain CDRl comprising SEQ ID NO: 10, a light chain CDR2 comprising SEQ ID NO: 11, and a light chain CDR3 comprising SEQ ID NO:6.
- a GCGR-binding protein comprises a light chain CDRl comprising SEQ ID NO: 4, a light chain CDR2 comprising SEQ ID NO:5, and a light chain CDR3 comprising SEQ ID NO:6.
- a GCGR-binding protein comprises a light chain CDRl comprising SEQ ID NO: 16, a light chain CDR2 comprising SEQ ID NO: 11, and a light chain CDR3 comprising SEQ ID NO: 17.
- a GCGR-binding protein comprises a light chain CDRl comprising SEQ ID NO:21, a light chain CDR2 comprising SEQ ID NO:22, and a light chain CDR3 comprising SEQ ID NO:23.
- the GCGR-binding protein is an antibody.
- the antibody is a humanized antibody.
- the GCGR-binding protein is an antigen- binding antibody fragment.
- a GCGR-binding protein comprises a heavy chain CDRl comprising SEQ ID NO: 1, a heavy chain CDR2 comprising SEQ ID NO: 2, a heavy chain CDR3 comprising SEQ ID NO:3, a light chain CDRl comprising SEQ ID NO:4, a light chain CDR2 comprising SEQ ID NO:5, and a light chain CDR3 comprising SEQ ID NO: 6.
- a GCGR-binding protein comprises a heavy chain CDRl comprising SEQ ID NO:7, a heavy chain CDR2 comprising SEQ ID NO:8, a heavy chain CDR3 comprising SEQ ID NO:9, a light chain CDRl comprising SEQ ID NO: 10, a light chain CDR2 comprising SEQ ID NO: 11, and a light chain CDR3 comprising SEQ ID NO: 6.
- a GCGR-binding protein comprises a heavy chain CDRl comprising SEQ ID NO: 12, a heavy chain CDR2 comprising SEQ ID NO: 2, a heavy chain CDR3 comprising SEQ ID NO: 3, a light chain CDRl comprising SEQ ID NO:4, a light chain CDR2 comprising SEQ ID NO:5, and a light chain CDR3 comprising SEQ ID NO:6.
- a GCGR-binding protein comprises a heavy chain CDRl comprising SEQ ID NO: 13, a heavy chain CDR2 comprising SEQ ID NO: 14, a heavy chain CDR3 comprising SEQ ID NO: 15, a light chain CDRl comprising SEQ ID NO: 16, a light chain CDR2 comprising SEQ ID NO: 1 1, and a light chain CDR3 comprising SEQ ID NO: 17.
- a GCGR-binding protein comprises a heavy chain CDRl comprising SEQ ID NO: 18, a heavy chain CDR2 comprising SEQ ID NO: 19, a heavy chain CDR3 comprising SEQ ID NO:20, a light chain CDRl comprising SEQ ID NO:21, a light chain CDR2 comprising SEQ ID NO:22, and a light chain CDR3 comprising SEQ ID NO:23.
- a GCGR-binding protein comprises a heavy chain CDRl comprising SEQ ID NO: 1, a heavy chain CDR2 comprising SEQ ID NO: 24, a heavy chain CDR3 comprising SEQ ID NO:3, a light chain CDRl comprising SEQ ID NO: 4, a light chain CDR2 comprising SEQ ID NO: 5, and a light chain CDR3 comprising SEQ ID NO: 6.
- the GCGR- binding protein is an antibody.
- the antibody is a humanized antibody.
- the GCGR-binding protein is an antigen-binding antibody fragment.
- a GCGR-binding protein comprises a heavy chain CDR1 comprising SEQ ID NO: 1, a heavy chain CDR2 comprising SEQ ID NO: 2, a heavy chain CDR3 comprising SEQ ID NO: 3, and a light chain variable region comprising SEQ ID NO: 26.
- a GCGR- binding protein comprises a heavy chain CDR1 comprising SEQ ID NO:7, a heavy chain CDR2 comprising SEQ ID NO:8, a heavy chain CDR3 comprising SEQ ID NO:9, and a light chain variable region comprising SEQ ID NO: 26.
- a GCGR-binding protein comprising a heavy chain CDR1 comprising SEQ ID NO: 12, a heavy chain CDR2 comprising SEQ ID NO:2, a heavy chain CDR3 comprising SEQ ID NO: 3, and a light chain variable region comprising SEQ ID NO: 26.
- a GCGR-binding protein comprises a heavy chain CDR1 comprising SEQ ID NO: 13, a heavy chain CDR2 comprising SEQ ID NO: 14, a heavy chain CDR3 comprising SEQ ID NO: 15, and a light chain variable region comprising SEQ ID NO: 26.
- a GCGR- binding protein comprises a heavy chain CDR1 comprising SEQ ID NO: 18, a heavy chain CDR2 comprising SEQ ID NO: 19, a heavy chain CDR3 comprising SEQ ID NO:20, and a light chain variable region comprising SEQ ID NO: 26.
- a GCGR-binding protein comprises a heavy chain CDR1 comprising SEQ ID NO: 1, a heavy chain CDR2 comprising SEQ ID NO:24, a heavy chain CDR3 comprising SEQ ID NO: 3, and a light chain variable region comprising SEQ ID NO: 26.
- the GCGR-binding protein is an antibody.
- the antibody is a humanized antibody.
- the GCGR-binding protein is an antigen-binding antibody fragment.
- a GCGR-binding protein comprises a heavy chain CDR1 comprising SEQ ID NO: 1, a heavy chain CDR2 comprising SEQ ID NO: 2, a heavy chain CDR3 comprising SEQ ID NO: 3, and a light chain variable region comprising SEQ ID NO: 221.
- a GCGR- binding protein comprises a heavy chain CDR1 comprising SEQ ID NO:7, a heavy chain CDR2 comprising SEQ ID NO:8, a heavy chain CDR3 comprising SEQ ID NO:9, and a light chain variable region comprising SEQ ID NO:221.
- a GCGR-binding protein comprises a heavy chain CDR1 comprising SEQ ID NO: 12, a heavy chain CDR2 comprising SEQ ID NO:2, a heavy chain CDR3 comprising SEQ ID NO:3, and a light chain variable region comprising SEQ ID NO:221.
- a GCGR-binding protein comprises a heavy chain CDR1 comprising SEQ ID NO: 13, a heavy chain CDR2 comprising SEQ ID NO: 14, a heavy chain CDR3 comprising SEQ ID NO: 15, and a light chain variable region comprising SEQ ID NO: 221.
- a GCGR- binding protein comprises a heavy chain CDR1 comprising SEQ ID NO: 18, a heavy chain CDR2 comprising SEQ ID NO: 19, a heavy chain CDR3 comprising SEQ ID NO:20, and a light chain variable region comprising SEQ ID NO:221.
- a GCGR-binding protein comprises a heavy chain CDRl comprising SEQ ID NO: 1, a heavy chain CDR2 comprising SEQ ID NO:24, a heavy chain CDR3 comprising SEQ ID NO: 3, and a light chain variable region comprising SEQ ID NO: 221.
- the GCGR-binding protein is an antibody.
- the antibody is a humanized antibody.
- the GCGR-binding protein is an antigen-binding antibody fragment.
- a GCGR-binding protein comprises a heavy chain variable region comprising SEQ ID NO:25, a light chain CDRl comprising SEQ ID NO:4, a light chain CDR2 comprising SEQ ID NO:5, and a light chain CDR3 comprising SEQ ID NO:6.
- a GCGR-binding protein comprises a heavy chain variable region comprising SEQ ID NO: 25, a light chain CDRl comprising SEQ ID NO: 10, a light chain CDR2 comprising SEQ ID NO: 11, and a light chain CDR3 comprising SEQ ID NO:6.
- a GCGR-binding protein comprises a heavy chain variable region comprising SEQ ID NO:25, a light chain CDRl comprising SEQ ID NO: 16, a light chain CDR2 comprising SEQ ID NO: 11, and a light chain CDR3 comprising SEQ ID NO: 17.
- a GCGR-binding protein comprises a heavy chain variable region comprising SEQ ID NO:25, a light chain CDRl comprising SEQ ID NO:21, a light chain CDR2 comprising SEQ ID NO:22, and a light chain CDR3 comprising SEQ ID NO: 23.
- the GCGR-binding protein is an antibody.
- the antibody is a humanized antibody.
- the GCGR-binding protein is an antigen-binding antibody fragment.
- a GCGR-binding protein comprises a heavy chain variable region comprising SEQ ID NO:220, a light chain CDRl comprising SEQ ID NO:4, a light chain CDR2 comprising SEQ ID NO:5, and a light chain CDR3 comprising SEQ ID NO:6.
- a GCGR-binding protein comprises a heavy chain variable region comprising SEQ ID NO: 220, a light chain CDRl comprising SEQ ID NO: 10, a light chain CDR2 comprising SEQ ID NO: 11, and a light chain CDR3 comprising SEQ ID NO: 6.
- a GCGR-binding protein comprises a heavy chain variable region comprising SEQ ID NO: 220, a light chain CDRl comprising SEQ ID NO: 16, a light chain CDR2 comprising SEQ ID NO: 11, and a light chain CDR3 comprising SEQ ID NO: 17.
- a GCGR-binding protein comprises a heavy chain variable region comprising SEQ ID NO:220, a light chain CDRl comprising SEQ ID NO:21, a light chain CDR2 comprising SEQ ID NO:22, and a light chain CDR3 comprising SEQ ID NO:23.
- the GCGR-binding protein is an antibody.
- the antibody is a humanized antibody.
- the GCGR-binding protein is an antigen-binding antibody fragment.
- a GCGR-binding protein comprises a heavy chain CDRl comprising SEQ ID NO: 1, a heavy chain CDR2 comprising DIX 1 PGGX 2 YX 3 NYNX 4 KHKX 5 (SEQ ID NO: 237), and a heavy chain CDR3 comprising SEQ ID NO: 3.
- a GCGR-binding protein comprises a heavy chain CDR1 comprising SEQ ID NO:7, a heavy chain CDR2 comprising
- a GCGR-binding protein comprises a heavy chain CDR1 comprising SEQ ID NO: 12, a heavy chain CDR2 comprising DIX 1PGGX2YX3NYNX4KHKX5 (SEQ ID NO: 237), and a heavy chain CDR3 comprising SEQ ID NO:3.
- a GCGR-binding protein comprises a heavy chain CDR1 comprising SEQ ID NO: 13, a heavy chain CDR2 comprising
- a GCGR-binding protein comprises a heavy chain CDR1 comprising SEQ ID NO: 18, a heavy chain CDR2 comprising DIX 1PGGX2YX3NYNX4KHKX5 (SEQ ID NO:237), and a heavy chain CDR3 comprising SEQ ID NO: 20.
- a GCGR-binding protein comprises a heavy chain CDR1 comprising SEQ ID NO: 11, a heavy chain CDR2 comprising
- DIX 1 PGGX 2 YX3NYNX 4 KHKX5 (SEQ ID NO:237), and a heavy chain CDR3 comprising SEQ ID NO:3.
- Xi is Y, H, F, or S.
- Xi is Y.
- Xi is a heavy chain CDR3 comprising SEQ ID NO:3.
- Xi is F. In other embodiments, Xi is S. In some embodiments, X 2 is Y, G, F, or D. In some embodiments, X 2 is Y. In another embodiment, X 2 is G. In some embodiments, X 2 is F. In other embodiments, X2 is D. In some embodiments, X3 is I, T, D, N, or S. In some embodiments, X3 is
- X3 is T. In some embodiments, X3 is D. In other embodiments, X3 is N. In some embodiments, X3 is S. In some embodiments, X4 is E, K, D, G, or A. In some embodiments, X4 is E. In another embodiment, X 4 is K. In some embodiments, X 4 is D. In other embodiments, X 4 is G. In some embodiments, X4 is A. In some embodiments, X5 is G, S, or D. In some embodiments, X5 is G. In another embodiment, X5 is S. In some embodiments, X5 is D. In some embodiments, the GCGR-binding protein is an antibody. In some embodiments, the antibody is a humanized antibody. In another embodiment, the GCGR-binding protein is an antigen-binding antibody fragment.
- a GCGR-binding protein comprises a heavy chain CDR1 comprising SEQ ID NO: 1, a heavy chain CDR2 comprising DIX 1PGGX2YX3NYNX4KHKX5 (SEQ ID NO: 237), a heavy chain CDR3 comprising SEQ ID NO:3, a light chain CDR1 comprising SEQ ID NO: 4, a light chain CDR2 comprising SEQ ID NO: 5, and a light chain CDR3 comprising SEQ ID NO: 6.
- a GCGR-binding protein comprises a heavy chain CDR1 comprising SEQ ID NO:7, a heavy chain CDR2 comprising DIX1PGGX2YX3NYNX4KHKX5 (SEQ ID NO:237), a heavy chain CDR3 comprising SEQ ID NO: 9, a light chain CDR1 comprising SEQ ID NO: 10, a light chain CDR2 comprising SEQ ID NO: 1 1, and a light chain CDR3 comprising SEQ ID NO: 6.
- a GCGR-binding protein comprises a heavy chain CDR1 comprising SEQ ID NO: 12, a heavy chain CDR2 comprising DIX 1 PGGX 2 YX 3 NYNX 4 KHKX 5 (SEQ ID NO:237), a heavy chain CDR3 comprising SEQ ID NO:3, a light chain CDRl comprising SEQ ID NO:4, a light chain CDR2 comprising SEQ ID NO:5, and a light chain CDR3 comprising SEQ ID NO:6.
- a GCGR-binding protein comprises a heavy chain CDRl comprising SEQ ID NO: 13, a heavy chain CDR2 comprising
- a GCGR-binding protein comprises a heavy chain CDRl comprising SEQ ID NO: 18, a heavy chain CDR2 comprising
- DIX1PGGX2YX3NYNX4KHKX5 (SEQ ID NO:237), a heavy chain CDR3 comprising SEQ ID NO:20, a light chain CDRl comprising SEQ ID NO:21, a light chain CDR2 comprising SEQ ID NO: 22, and a light chain CDR3 comprising SEQ ID NO:23.
- Xi is Y, H, F, or S.
- Xi is Y.
- Xi is H.
- Xi is F.
- Xi is S.
- X2 is Y, G, F, or D.
- X2 is Y.
- X 2 is G. In some embodiments, X 2 is F. In other embodiments, X 2 is D. In some embodiments, X3 is I, T, D, N, or S. In some embodiments, X3 is I. In another embodiment, X3 is T. In some embodiments, X3 is D. In other embodiments, X3 is N. In some embodiments, X3 is S. In some embodiments, X 4 is E, K, D, G, or A. In some embodiments, X 4 is E. In another embodiment, X 4 is K. In some embodiments, X4 is D. In other embodiments, X4 is G. In some embodiments, X4 is A.
- X5 is G, S, or D. In some embodiments, X5 is G. In another embodiment, X5 is S. In some embodiments, X5 is D. In some embodiments, the GCGR-binding protein is an antibody. In some embodiments, the antibody is a humanized antibody. In another embodiment, the GCGR-binding protein is an antigen-binding antibody fragment.
- a GCGR-binding protein comprises a heavy chain CDRl comprising SEQ ID NO: 1, a heavy chain CDR2 comprising DIX 1PGGX2YX3NYNX4KHKX5 (SEQ ID NO: 237), a heavy chain CDR3 comprising SEQ ID NO:3, and a light chain variable region comprising SEQ ID NO:
- a GCGR-binding protein comprises a heavy chain CDRl comprising SEQ ID NO:7, a heavy chain CDR2 comprising DIX 1PGGX2YX3NYNX4KHKX5 (SEQ ID NO:237), a heavy chain CDR3 comprising SEQ ID NO: 9, and a light chain variable region comprising SEQ ID NO:
- a GCGR-binding protein comprises a heavy chain CDRl comprising SEQ ID NO: 12, a heavy chain CDR2 comprising DIX 1PGGX2YX3NYNX4KHKX5 (SEQ ID NO: 237), a heavy chain CDR3 comprising SEQ ID NO: 3, and a light chain variable region comprising SEQ ID NO: 26.
- a GCGR-binding protein comprises a heavy chain CDRl comprising SEQ ID NO: 12
- a heavy chain CDR2 comprising DIX 1 PGGX 2 YX 3 NYNX 4 KHKX 5 (SEQ ID NO:237), a heavy chain CDR3 comprising SEQ ID NO: 15, and a light chain variable region comprising SEQ ID NO: 26.
- a GCGR-binding protein comprises a heavy chain CDRl comprising SEQ ID NO: 18, a heavy chain CDR2 comprising DIX1PGGX2YX3NYNX4KHKX5 (SEQ ID NO:237), a heavy chain CDR3 comprising SEQ ID NO:20, and a light chain variable region comprising SEQ ID NO:26.
- a GCGR-binding protein comprises a heavy chain CDR1 comprising SEQ ID NO: 1, a heavy chain CDR2 comprising DIX1PGGX2YX3NYNX4KHKX5 (SEQ ID NO:237), a heavy chain CDR3 comprising SEQ ID NO:3, and a light chain variable region comprising SEQ ID NO:221.
- a GCGR-binding protein comprises a heavy chain CDR1 comprising SEQ ID NO:7, a heavy chain CDR2 comprising DIX1PGGX2YX3NYNX4KHKX5 (SEQ ID NO:237), a heavy chain CDR3 comprising SEQ ID NO:9, and a light chain variable region comprising SEQ ID NO:221.
- a GCGR-binding protein comprises a heavy chain CDR1 comprising SEQ ID NO: 12, a heavy chain CDR2 comprising DIX1PGGX2YX3NYNX4KHKX5 (SEQ ID NO:237), a heavy chain CDR3 comprising SEQ ID NO:3, and a light chain variable region comprising SEQ ID NO:221.
- a GCGR-binding protein comprises a heavy chain CDR1 comprising SEQ ID NO: 13, a heavy chain CDR2 comprising DIX 1 PGGX 2 YX 3 NYNX 4 KHKX 5 (SEQ ID NO:237), a heavy chain CDR3 comprising SEQ ID NO: 15, and a light chain variable region comprising SEQ ID NO:221.
- a GCGR-binding protein comprises a heavy chain CDR1 comprising SEQ ID NO: 18, a heavy chain CDR2 comprising DIX 1 PGGX 2 YX 3 NYNX 4 KHKX 5 (SEQ ID NO:237), a heavy chain CDR3 comprising SEQ ID NO:20, and a light chain variable region comprising SEQ ID NO:221.
- Xi is Y, H, F, or S.
- Xi is Y.
- Xi is H.
- Xi is F.
- Xi is S.
- X2 is Y, G, F, or D.
- X2 is Y. In another embodiment, X2 is G. In some embodiments, X2 is F. In other embodiments, X2 is D. In some embodiments, X3 is I, T, D, N, or S. In some embodiments, X3 is I. In another embodiment, X3 is T. In some embodiments, X3 is D. In other embodiments, X3 is N. In some embodiments, X3 is S. In some embodiments, X4 is E, K, D, G, or A. In some embodiments, X4 is E. In another embodiment, X4 is K. In some embodiments, X4 is D. In other embodiments, X4 is G. In some embodiments, X4 is A.
- X5 is G, S, or D. In some embodiments, X5 is G. In another embodiment, X5 is S. In some embodiments, X5 is D. In some embodiments, the GCGR-binding protein is an antibody. In some embodiments, the antibody is a humanized antibody. In another embodiment, the GCGR-binding protein is an antigen-binding antibody fragment.
- a GCGR-binding protein comprises a light chain CDR1 comprising RSSQX6lVX 7 SX 8 GNTYLE (SEQ ID NO:238), a light chain CDR2 comprising SEQ ID NO:5, and a light chain CDR3 comprising SEQ ID NO: 6.
- a GCGR-binding protein comprises a light chain CDR1 comprising RSSQX 6 IVX 7 SX 8 GNTYLE (SEQ ID NO:238), a light chain CDR2 comprising SEQ ID NO: 1 1, and a light chain CDR3 comprising SEQ ID NO: 6.
- a GCGR-binding protein comprises a light chain CDR1 comprising RSSQX 6 IVX 7 SX 8 GNTYLE (SEQ ID NO: 238), a light chain CDR2 comprising SEQ ID NO: 5, and a light chain CDR3 comprising SEQ ID NO:6.
- a GCGR-binding protein comprises a light chain CDRl comprising RSSQX 6 IVX 7 SX 8 GNTYLE (SEQ ID NO:238), a light chain CDR2 comprising SEQ ID NO: 1 1, and a light chain CDR3 comprising SEQ ID NO: 17.
- a GCGR-binding protein comprises a light chain CDRl comprising RSSQX 6 IVX 7 SX 8 GNTYLE (SEQ ID NO:238), a light chain CDR2 comprising SEQ ID NO: 22, and a light chain CDR3 comprising SEQ ID NO: 23.
- Xe is S, T, or H.
- Xe is S.
- Xe is T.
- Xe is H.
- X7 is D, H, or Y.
- X7 is D.
- X7 is H.
- X7 is Y.
- X 8 is Y or D.
- X 8 is Y. In another embodiment, X 8 is D.
- the GCGR-binding protein is an antibody. In some embodiments, the antibody is a humanized antibody. In another embodiment, the GCGR-binding protein is an antigen-binding antibody fragment.
- a GCGR-binding protein comprises a heavy chain CDRl comprising SEQ ID NO: 1, a heavy chain CDR2 comprising SEQ ID NO: 2, a heavy chain CDR3 comprising SEQ ID NO:3, a light chain CDRl comprising RSSQX 6 IVX 7 SX 8 GNTYLE (SEQ ID NO:238), a light chain CDR2 comprising SEQ ID NO: 5, and a light chain CDR3 comprising SEQ ID NO: 6.
- a GCGR-binding protein comprises a heavy chain CDRl comprising SEQ ID NO: 7, a heavy chain CDR2 comprising SEQ ID NO:8, a heavy chain CDR3 comprising SEQ ID NO:9, a light chain CDRl comprising RSSQX6lVX 7 SX 8 GNTYLE (SEQ ID NO:238), a light chain CDR2 comprising SEQ ID NO: 1 1, and a light chain CDR3 comprising SEQ ID NO: 6.
- a GCGR-binding protein comprises a heavy chain CDRl comprising SEQ ID NO: 12, a heavy chain CDR2 comprising SEQ ID NO: 2, a heavy chain CDR3 comprising SEQ ID NO: 3, a light chain CDRl comprising
- a GCGR-binding protein comprises a heavy chain CDRl comprising SEQ ID NO: 13, a heavy chain CDR2 comprising SEQ ID NO: 14, a heavy chain CDR3 comprising SEQ ID NO: 15, a light chain CDRl comprising RSSQX6lVX 7 SX 8 GNTYLE (SEQ ID NO: 238), a light chain CDR2 comprising SEQ ID NO: 1 1, and a light chain CDR3 comprising SEQ ID NO: 17.
- a GCGR-binding protein comprises a heavy chain CDRl comprising SEQ ID NO: 18, a heavy chain CDR2 comprising SEQ ID NO: 19, a heavy chain CDR3 comprising SEQ ID NO:20, a light chain CDRl comprising RSSQX 6 IVX 7 SX 8 GNTYLE (SEQ ID NO: 238), a light chain CDR2 comprising SEQ ID NO: 22, and a light chain CDR3 comprising SEQ ID NO:23.
- a GCGR-binding protein comprises a heavy chain CDRl comprising SEQ ID NO: 1, a heavy chain CDR2 comprising SEQ ID NO: 24, a heavy chain CDR3 comprising SEQ ID NO:3, a light chain CDRl comprising RSSQX 6 IVX 7 SX 8 GNTYLE (SEQ ID NO:238), a light chain CDR2 comprising SEQ ID NO: 5, and a light chain CDR3 comprising SEQ ID NO: 6.
- Xe is S, T, or H.
- Xe is S.
- Xe is T.
- Xe is H.
- X7 is D, H, or Y.
- X7 is D. In another embodiment, X7 is H. In some embodiments, X7 is Y. In some embodiments, X 8 is Y or D. In some embodiments, X 8 is Y. In another embodiment, X 8 is D. In some embodiments, the GCGR-binding protein is an antibody. In some embodiments, the antibody is a humanized antibody. In another embodiment, the GCGR-binding protein is an antigen-binding antibody fragment.
- a GCGR-binding protein comprises a heavy chain variable region comprising SEQ ID NO:25, a light chain CDR1 comprising RSSQX6lVX 7 SX 8 GNTYLE (SEQ ID NO: 238), a light chain CDR2 comprising SEQ ID NO: 5, and a light chain CDR3 comprising SEQ ID NO:6.
- a GCGR-binding protein comprises a heavy chain variable region comprising SEQ ID NO:25, a light chain CDR1 comprising RSSQX6lVX 7 SX 8 GNTYLE (SEQ ID NO: 238), a light chain CDR2 comprising SEQ ID NO: 1 1, and a light chain CDR3 comprising SEQ ID NO:6.
- a GCGR-binding protein comprises a heavy chain variable region comprising SEQ ID NO:25, a light chain CDR1 comprising RSSQX 6 IVX 7 SX 8 GNTYLE (SEQ ID NO: 238), a light chain CDR2 comprising SEQ ID NO: 1 1, and a light chain CDR3 comprising SEQ ID NO: 17.
- a GCGR-binding protein comprises a heavy chain variable region comprising SEQ ID NO:25, a light chain CDR1 comprising RSSQX6lVX 7 SX 8 GNTYLE (SEQ ID NO: 238), a light chain CDR2 comprising SEQ ID NO: 22, and a light chain CDR3 comprising SEQ ID NO:23.
- a GCGR-binding protein comprises a heavy chain variable region comprising SEQ ID NO:220, a light chain CDR1 comprising RSSQX 6 IVX 7 SX 8 GNTYLE (SEQ ID NO: 238), a light chain CDR2 comprising SEQ ID NO: 5, and a light chain CDR3 comprising SEQ ID NO:6.
- a GCGR-binding protein comprises a heavy chain variable region comprising SEQ ID NO:220, a light chain CDR1 comprising RSSQX 6 IVX 7 SX 8 GNTYLE (SEQ ID NO: 238), a light chain CDR2 comprising SEQ ID NO: 1 1, and a light chain CDR3 comprising SEQ ID NO:6.
- a GCGR-binding protein comprises a heavy chain variable region comprising SEQ ID NO:220, a light chain CDR1 comprising RSSQX 6 IVX 7 SX 8 GNTYLE (SEQ ID NO: 238), a light chain CDR2 comprising SEQ ID NO: 1 1, and a light chain CDR3 comprising SEQ ID NO: 17.
- a GCGR-binding protein comprises a heavy chain variable region comprising SEQ ID NO:220, a light chain CDR1 comprising RSSQX 6 IVX 7 SX 8 GNTYLE (SEQ ID NO: 238), a light chain CDR2 comprising SEQ ID NO: 22, and a light chain CDR3 comprising SEQ ID NO:23.
- Xe is S, T, or H.
- Xe is S.
- Xe is T.
- Xe is H.
- X7 is D, H, or Y.
- X7 is D.
- X7 is H.
- X7 is Y.
- X 8 is Y or D.
- X 8 is Y.
- X 8 is D.
- the GCGR-binding protein is an antibody.
- the antibody is a humanized antibody.
- the GCGR-binding protein is an antigen-binding antibody fragment.
- a GCGR-binding protein comprises a heavy chain CDRl comprising SEQ ID NO: 1, a heavy chain CDR2 comprising DIX 1PGGX2YX3NYNX4KHKX5 (SEQ ID NO: 237), a heavy chain CDR3 comprising SEQ ID NO:3, a light chain CDRl comprising
- a GCGR-binding protein comprises a heavy chain CDRl comprising SEQ ID NO:7, a heavy chain CDR2 comprising
- DIX1PGGX2YX3NYNX4KHKX5 (SEQ ID NO:237), a heavy chain CDR3 comprising SEQ ID NO:9, a light chain CDRl comprising RSSQX6lVX 7 SX 8 GNTYLE (SEQ ID NO:238), a light chain CDR2 comprising SEQ ID NO: 1 1, and a light chain CDR3 comprising SEQ ID NO: 6.
- a GCGR-binding protein comprises a heavy chain CDRl comprising SEQ ID NO: 12, a heavy chain CDR2 comprising DIX 1 PGGX 2 YX 3 NYNX 4 KHKX 5 (SEQ ID NO:237), a heavy chain CDR3 comprising SEQ ID NO:3, a light chain CDRl comprising RSSQX 6 IVX 7 SX 8 GNTYLE (SEQ ID NO:238), a light chain CDR2 comprising SEQ ID NO: 5, and a light chain CDR3 comprising SEQ ID NO: 6.
- a GCGR-binding protein comprises a heavy chain CDRl comprising SEQ ID NO: 13, a heavy chain CDR2 comprising DIX1PGGX2YX3NYNX4KHKX5 (SEQ ID NO:237), a heavy chain CDR3 comprising SEQ ID NO: 15, a light chain CDRl comprising RSSQX6lVX 7 SX 8 GNTYLE (SEQ ID NO: 238), a light chain CDR2 comprising SEQ ID NO: 1 1, and a light chain CDR3 comprising SEQ ID NO: 17.
- a GCGR-binding protein comprises a heavy chain CDRl comprising SEQ ID NO: 18, a heavy chain CDR2 comprising DIX 1PGGX2YX3NYNX4KHKX5 (SEQ ID NO:237), a heavy chain CDR3 comprising SEQ ID NO:20, a light chain CDRl comprising RSSQX 6 IVX 7 SX 8 GNTYLE (SEQ ID NO:238), a light chain CDR2 comprising SEQ ID NO:22, and a light chain CDR3 comprising SEQ ID NO:23.
- Xi is Y, H, F, or S.
- Xi is Y.
- Xi is H.
- Xi is F. In other embodiments, Xi is S. In some embodiments, X2 is Y, G, F, or D. In some embodiments, X2 is Y. In another embodiment, X2 is G. In some embodiments, X2 is F. In other embodiments, X2 is D. In some embodiments, X3 is I, T, D, N, or S. In some embodiments, X3 is I. In another embodiment, X3 is T. In some embodiments, X3 is D. In other embodiments, X3 is N. In some embodiments, X3 is S. In some embodiments, X4 is E, K, D, G, or A. In some embodiments, X 4 is E.
- X 4 is K. In some embodiments, X 4 is D. In other embodiments, X 4 is G. In some embodiments, X 4 is A. In some embodiments, X5 is G, S, or D. In some embodiments, X5 is G. In another embodiment, X5 is S. In some embodiments, X5 is D. In some embodiments, Xe is S, T, or H. In some embodiments, Xe is S. In another embodiment, Xe is T. In some embodiments, ⁇ is H. In some embodiments, X7 is D, H, or Y. In some embodiments, X7 is D. In another embodiment, X7 is H. In some embodiments, X7 is Y.
- Xs is Y or D. In some embodiments, Xs is Y. In another embodiment, Xs is D. In some embodiments, the GCGR-binding protein is an antibody. In some embodiments, the antibody is a humanized antibody. In another embodiment, the GCGR-binding protein is an antigen-binding antibody fragment.
- a GCGR-binding protein (e.g., an antibody) comprises (a) a heavy chain CDRl comprising SEQ ID NOs:27, 33, 38, 39, or 44; a heavy chain CDR2 comprising SEQ ID NOs:28, 34, 40, 45, or 50; and a heavy chain CDR3 comprising SEQ ID NOs:29, 35, 41, or 46; and/or (b) a light chain CDRl comprising SEQ ID NOs:30, 36, 42, or 47; a light chain CDR2 comprising SEQ ID NOs:31, 37, or 48; and a light chain CDR3 comprising SEQ ID NOs:32, 43, or 49.
- a GCGR-binding protein (e.g., an antibody) comprises (a) a heavy chain CDRl comprising SEQ ID NO:27; a heavy chain CDR2 comprising SEQ ID NO:28; and a heavy chain CDR3 comprising SEQ ID NO:29; and/or (b) a light chain CDRl comprising SEQ ID NO:30; a light chain CDR2 comprising SEQ ID NO:31 ; and a light chain CDR3 comprising SEQ ID NO:32.
- a GCGR-binding protein (e.g., an antibody) comprises (a) a heavy chain CDRl comprising SEQ ID NOs:53, 57, 61, 62, or 65; a heavy chain CDR2 comprising SEQ ID NOs:54, 58, 40, 66, or 70; and a heavy chain CDR3 comprising SEQ ID NOs:55, 59, 63, or 67; and/or (b) a light chain CDRl comprising SEQ ID NOs:56, 60, 64, or 68; a light chain CDR2 comprising SEQ ID NOs:31, 37, or 69; and a light chain CDR3 comprising SEQ ID NOs:32, 43, or 49.
- a heavy chain CDRl comprising SEQ ID NOs:53, 57, 61, 62, or 65
- a heavy chain CDR2 comprising SEQ ID NOs:54, 58, 40, 66, or 70
- a heavy chain CDR3 comprising
- a GCGR-binding protein (e.g., an antibody) comprises (a) a heavy chain CDRl comprising SEQ ID NO:53; a heavy chain CDR2 comprising SEQ ID NO:54; and a heavy chain CDR3 comprising SEQ ID NO:55; and/or (b) a light chain CDRl comprising SEQ ID NO:56; a light chain CDR2 comprising SEQ ID NO:31 ; and a light chain CDR3 comprising SEQ ID NO:32.
- a GCGR-binding protein (e.g., an antibody) comprises (a) a heavy chain CDRl comprising SEQ ID NOs:73, 79, 84, 85, or 90; a heavy chain CDR2 comprising SEQ ID NOs:74, 80, 86, 91, or 96; and a heavy chain CDR3 comprising SEQ ID NOs:75, 81, 87, or 92; and/or (b) a light chain CDRl comprising SEQ ID NOs:76, 82, 88, or 93; a light chain CDR2 comprising SEQ ID NOs:77, 83, or 94; and a light chain CDR3 comprising SEQ ID NOs:78, 89, or 95.
- a heavy chain CDRl comprising SEQ ID NOs:73, 79, 84, 85, or 90
- a heavy chain CDR2 comprising SEQ ID NOs:74, 80, 86, 91, or 96
- a GCGR-binding protein (e.g., an antibody) comprises (a) a heavy chain CDRl comprising SEQ ID NO:73; a heavy chain CDR2 comprising SEQ ID NO:74; and a heavy chain CDR3 comprising SEQ ID NO:75; and/or (b) a light chain CDRl comprising SEQ ID NO:76; a light chain CDR2 comprising SEQ ID NO:77; and a light chain CDR3 comprising SEQ ID NO:78.
- a GCGR-binding protein (e.g., an antibody) comprises (a) a heavy chain CDRl comprising SEQ ID NOs:99, 105, 1 10, 1 1 1, or 1 15; a heavy chain CDR2 comprising SEQ ID NOs: 100, 106, 86, 1 16, or 121 ; and a heavy chain CDR3 comprising SEQ ID NOs: 101, 107, 1 12, or 1 17; and/or (b) a light chain CDRl comprising SEQ ID NOs: 102, 108, 1 13, or 1 18; a light chain CDR2 comprising SEQ ID NOs: 103, 109, or 1 19; and a light chain CDR3 comprising SEQ ID NOs: 104, 114, or 120.
- a heavy chain CDRl comprising SEQ ID NOs:99, 105, 1 10, 1 1 1, or 1 15
- a heavy chain CDR2 comprising SEQ ID NOs: 100, 106, 86, 1 16, or 121
- a GCGR-binding protein (e.g. , an antibody) comprises (a) a heavy chain CDRl comprising SEQ ID NO:99; a heavy chain CDR2 comprising SEQ ID NO: 100; and a heavy chain CDR3 comprising SEQ ID NO: 101 ; and/or (b) a light chain CDRl comprising SEQ ID NO: 102; a light chain CDR2 comprising SEQ ID NO: 103; and a light chain CDR3 comprising SEQ ID NO: 104.
- a GCGR-binding protein (e.g., an antibody) comprises (a) a heavy chain CDRl comprising SEQ ID NOs: 124, 129, 133, 134, or 138; a heavy chain CDR2 comprising SEQ ID NOs: 125, 130, 135, 139, 143; and a heavy chain CDR3 comprising SEQ ID NOs: 126, 131, 136, or 140; and/or (b) a light chain CDRl comprising SEQ ID NOs: 127, 132, 137, or 141 ; a light chain CDR2 comprising SEQ ID NOs: 128, 1 1, or 142; and a light chain CDR3 comprising SEQ ID NOs:6, 17, or 23.
- a heavy chain CDRl comprising SEQ ID NOs: 124, 129, 133, 134, or 138
- a heavy chain CDR2 comprising SEQ ID NOs: 125, 130, 135, 139, 143
- a GCGR-binding protein (e.g. , an antibody) comprises (a) a heavy chain CDRl comprising SEQ ID NO: 124; a heavy chain CDR2 comprising SEQ ID NO: 125; and a heavy chain CDR3 comprising SEQ ID NO: 126; and/or (b) a light chain CDRl comprising SEQ ID NO: 127; a light chain CDR2 comprising SEQ ID NO: 128; and a light chain CDR3 comprising SEQ ID NO:6.
- a GCGR-binding protein (e.g., an antibody) comprises (a) a heavy chain CDRl comprising SEQ ID NOs: 146, 150, 154, 155, or 159; a heavy chain CDR2 comprising SEQ ID NOs: 147, 151, 156, 160, or 163; and a heavy chain CDR3 comprising SEQ ID NOs: 148, 152, 157, or 161 ; and/or (b) a light chain CDRl comprising SEQ ID NOs: 149, 153, 158, or 162; a light chain CDR2 comprising SEQ ID NOs: 128, 1 1, or 142; and a light chain CDR3 comprising SEQ ID NOs:6, 17, or 23.
- a heavy chain CDRl comprising SEQ ID NOs: 146, 150, 154, 155, or 159
- a heavy chain CDR2 comprising SEQ ID NOs: 147, 151, 156, 160, or 163
- a GCGR-binding protein (e.g. , an antibody) comprises (a) a heavy chain CDRl comprising SEQ ID NO: 146; a heavy chain CDR2 comprising SEQ ID NO: 147; and a heavy chain CDR3 comprising SEQ ID NO: 148; and/or (b) a light chain CDRl comprising SEQ ID NO: 149; a light chain CDR2 comprising SEQ ID NO: 128; and a light chain CDR3 comprising SEQ ID NO:6.
- a GCGR-binding protein (e.g., an antibody) comprises (a) a heavy chain CDRl comprising SEQ ID NOs: 166, 172, 176, 177, or 182; a heavy chain CDR2 comprising SEQ ID NOs: 167, 173, 178, 183, or 187; and a heavy chain CDR3 comprising SEQ ID NOs: 168, 174, 179, or 184; and/or (b) a light chain CDRl comprising SEQ ID NOs: 169, 175, 180, or 185; a light chain CDR2 comprising SEQ ID NOs: 170, 1 1, or 142; and a light chain CDR3 comprising SEQ ID NOs: 171, 181, or 186.
- a heavy chain CDRl comprising SEQ ID NOs: 166, 172, 176, 177, or 182
- a heavy chain CDR2 comprising SEQ ID NOs: 167, 173, 178, 183, or
- a GCGR-binding protein (e.g. , an antibody) comprises (a) a heavy chain CDRl comprising SEQ ID NO: 166; a heavy chain CDR2 comprising SEQ ID NO: 167; and a heavy chain CDR3 comprising SEQ ID NO: 168; and/or (b) a light chain CDRl comprising SEQ ID NO: 169; a light chain CDR2 comprising SEQ ID NO: 170; and a light chain CDR3 comprising SEQ ID NO: 171.
- a GCGR-binding protein (e.g., an antibody) comprises (a) a heavy chain CDRl comprising SEQ ID NOs: 190, 172, 154, 177, or 198; a heavy chain CDR2 comprising SEQ ID NOs: 191, 194, 156, 199, or 202; and a heavy chain CDR3 comprising SEQ ID NOs: 192, 195, 196, or 200; and/or (b) a light chain CDRl comprising SEQ ID NOs: 169, 175, 180, or 185; a light chain CDR2 comprising SEQ ID NOs: 128, 1 1, or 142; and a light chain CDR3 comprising SEQ ID NOs: 193, 197, or 201.
- a heavy chain CDRl comprising SEQ ID NOs: 190, 172, 154, 177, or 198
- a heavy chain CDR2 comprising SEQ ID NOs: 191, 194, 156, 199, or 202
- a GCGR-binding protein (e.g. , an antibody) comprises (a) a heavy chain CDRl comprising SEQ ID NO: 190; a heavy chain CDR2 comprising SEQ ID NO: 191; and a heavy chain CDR3 comprising SEQ ID NO: 192; and/or (b) a light chain CDRl comprising SEQ ID NO: 169; a light chain CDR2 comprising SEQ ID NO: 128; and a light chain CDR3 comprising SEQ ID NO: 193.
- a GCGR-binding protein (e.g., an antibody) comprises (a) a heavy chain CDRl comprising SEQ ID NOs: 190, 172, 154, 177, or 198; a heavy chain CDR2 comprising SEQ ID NOs:205, 208, 21 1, 214, or 217; and a heavy chain CDR3 comprising SEQ ID NOs:206, 209, 212, or 215; and/or (b) a light chain CDRl comprising SEQ ID NOs:207, 210, 213, or 216; a light chain CDR2 comprising SEQ ID NOs: 128, 1 1, or 142; and a light chain CDR3 comprising SEQ ID NOs:6, 17, or 23.
- a heavy chain CDRl comprising SEQ ID NOs: 190, 172, 154, 177, or 198
- a heavy chain CDR2 comprising SEQ ID NOs:205, 208, 21 1, 214, or 217
- a GCGR-binding protein (e.g. , an antibody) comprises (a) a heavy chain CDRl comprising SEQ ID NO: 190; a heavy chain CDR2 comprising SEQ ID NO:205; and a heavy chain CDR3 comprising SEQ ID NO:206; and/or (b) a light chain CDRl comprising SEQ ID NO:207; a light chain CDR2 comprising SEQ ID NO: 128; and a light chain CDR3 comprising SEQ ID NO:6.
- a GCGR-binding protein (e.g., an antibody) comprises a heavy chain variable region having at least about 80% sequence identity to SEQ ID NO:25 and/or a light chain variable region having at least 80% sequence identity to SEQ ID NO:26. In some embodiments, a GCGR-binding protein comprises a heavy chain variable region having at least about 85%, at least about 90%, at least about 95%, at least about 97%, or at least about 99% sequence identity to SEQ ID NO:25.
- a GCGR-binding protein comprises a light chain variable region having at least about 85%, at least about 90%, at least about 95%, at least about 97%, or at least about 99% sequence identity to SEQ ID NO:26. In some embodiments, a GCGR-binding protein comprises a heavy chain variable region having at least about 95% sequence identity to SEQ ID NO:25 and/or a light chain variable region having at least about 95% sequence identity to SEQ ID NO:26. In some embodiments, a GCGR-binding protein comprises a heavy chain variable region comprising SEQ ID NO: 25 and/or a light chain variable region comprising SEQ ID NO: 26.
- a GCGR-binding protein comprises a heavy chain variable region comprising SEQ ID NO:25 and a light chain variable region comprising SEQ ID NO: 26. In some embodiments, a GCGR-binding protein comprises a heavy chain variable region consisting essentially of SEQ ID NO: 25 and a light chain variable region consisting essentially of SEQ ID NO: 26. In some embodiments, a GCGR-binding protein comprises a heavy chain variable region consisting of SEQ ID NO:25 and a light chain variable region consisting of SEQ ID NO:26. In some embodiments, the GCGR-binding protein is an antibody. In some embodiments, the antibody is a humanized antibody. In some embodiments, the GCGR-binding protein is an antigen- binding antibody fragment.
- a GCGR-binding protein (e.g. , an antibody) comprises a heavy chain variable region having at least about 80% sequence identity to SEQ ID NO:51 and/or a light chain variable region having at least 80% sequence identity to SEQ ID NO:52. In some embodiments, a GCGR-binding protein comprises a heavy chain variable region having at least about 85%, at least about 90%, at least about 95%, at least about 97%, or at least about 99% sequence identity to SEQ ID NO: 51.
- a GCGR-binding protein comprises a light chain variable region having at least about 85%, at least about 90%, at least about 95%, at least about 97%, or at least about 99% sequence identity to SEQ ID NO:52. In some embodiments, a GCGR-binding protein comprises a heavy chain variable region having at least about 95% sequence identity to SEQ ID NO: 51 and/or a light chain variable region having at least about 95% sequence identity to SEQ ID NO:52. In some embodiments, a GCGR-binding protein comprises a heavy chain variable region comprising SEQ ID NO: 51 and/or a light chain variable region comprising SEQ ID NO:52.
- a GCGR-binding protein comprises a heavy chain variable region comprising SEQ ID NO: 51 and a light chain variable region comprising SEQ ID NO:52. In some embodiments, a GCGR-binding protein comprises a heavy chain variable region consisting essentially of SEQ ID NO: 51 and a light chain variable region consisting essentially of SEQ ID NO:52. In some embodiments, a GCGR-binding protein comprises a heavy chain variable region consisting of SEQ ID NO: 51 and a light chain variable region consisting of SEQ ID NO:52.
- a GCGR-binding protein (e.g. , an antibody) comprises a heavy chain variable region having at least about 80% sequence identity to SEQ ID NO:71 and/or a light chain variable region having at least 80% sequence identity to SEQ ID NO:72. In some embodiments, a GCGR-binding protein comprises a heavy chain variable region having at least about 85%, at least about 90%, at least about 95%, at least about 97%, or at least about 99% sequence identity to SEQ ID NO:71.
- a GCGR-binding protein comprises a light chain variable region having at least about 85%, at least about 90%, at least about 95%, at least about 97%, or at least about 99% sequence identity to SEQ ID NO: 72. In some embodiments, a GCGR-binding protein comprises a heavy chain variable region having at least about 95% sequence identity to SEQ ID NO:71 and/or a light chain variable region having at least about 95% sequence identity to SEQ ID NO: 72. In some embodiments, a GCGR-binding protein comprises a heavy chain variable region comprising SEQ ID NO: 71 and/or a light chain variable region comprising SEQ ID NO: 72.
- a GCGR-binding protein comprises a heavy chain variable region comprising SEQ ID NO: 71 and a light chain variable region comprising SEQ ID NO: 72. In some embodiments, a GCGR-binding protein comprises a heavy chain variable region consisting essentially of SEQ ID NO: 71 and a light chain variable region consisting essentially of SEQ ID NO: 72. In some embodiments, a GCGR-binding protein comprises a heavy chain variable region consisting of SEQ ID NO:71 and a light chain variable region consisting of SEQ ID NO:72.
- a GCGR-binding protein (e.g. , an antibody) comprises a heavy chain variable region having at least about 80% sequence identity to SEQ ID NO:97 and/or a light chain variable region having at least 80% sequence identity to SEQ ID NO:98. In some embodiments, a GCGR-binding protein comprises a heavy chain variable region having at least about 85%, at least about 90%, at least about 95%, at least about 97%, or at least about 99% sequence identity to SEQ ID NO: 97.
- a GCGR-binding protein comprises a light chain variable region having at least about 85%, at least about 90%, at least about 95%, at least about 97%, or at least about 99% sequence identity to SEQ ID NO:98. In some embodiments, a GCGR-binding protein comprises a heavy chain variable region having at least about 95% sequence identity to SEQ ID NO: 97 and/or a light chain variable region having at least about 95% sequence identity to SEQ ID NO:98. In some embodiments, a GCGR-binding protein comprises a heavy chain variable region comprising SEQ ID NO: 97 and/or a light chain variable region comprising SEQ ID NO:98.
- a GCGR-binding protein comprises a heavy chain variable region comprising SEQ ID NO: 97 and a light chain variable region comprising SEQ ID NO:98. In some embodiments, a GCGR-binding protein comprises a heavy chain variable region consisting essentially of SEQ ID NO: 97 and a light chain variable region consisting essentially of SEQ ID NO:98. In some embodiments, a GCGR-binding protein comprises a heavy chain variable region consisting of SEQ ID NO: 97 and a light chain variable region consisting of SEQ ID NO:98.
- a GCGR-binding protein (e.g. , an antibody) comprises a heavy chain variable region having at least about 80% sequence identity to SEQ ID NO: 122 and/or a light chain variable region having at least 80% sequence identity to SEQ ID NO: 123. In some embodiments, a GCGR-binding protein comprises a heavy chain variable region having at least about 85%, at least about 90%, at least about 95%, at least about 97%, or at least about 99% sequence identity to SEQ ID NO: 122.
- a GCGR-binding protein comprises a light chain variable region having at least about 85%, at least about 90%, at least about 95%, at least about 97%, or at least about 99% sequence identity to SEQ ID NO: 123. In some embodiments, a GCGR-binding protein comprises a heavy chain variable region having at least about 95% sequence identity to SEQ ID NO: 122 and/or a light chain variable region having at least about 95% sequence identity to SEQ ID NO: 123. In some embodiments, a GCGR-binding protein comprises a heavy chain variable region comprising SEQ ID NO: 122 and/or a light chain variable region comprising SEQ ID NO: 123.
- a GCGR-binding protein comprises a heavy chain variable region comprising SEQ ID NO: 122 and a light chain variable region comprising SEQ ID NO: 123. In some embodiments, a GCGR-binding protein comprises a heavy chain variable region consisting essentially of SEQ ID NO: 122 and a light chain variable region consisting essentially of SEQ ID NO: 123. In some embodiments, a GCGR-binding protein comprises a heavy chain variable region consisting of SEQ ID NO: 122 and a light chain variable region consisting of SEQ ID NO: 123.
- a GCGR-binding protein (e.g. , an antibody) comprises a heavy chain variable region having at least about 80% sequence identity to SEQ ID NO: 144 and/or a light chain variable region having at least 80% sequence identity to SEQ ID NO: 145. In some embodiments, a GCGR-binding protein comprises a heavy chain variable region having at least about 85%, at least about 90%, at least about 95%, at least about 97%, or at least about 99% sequence identity to SEQ ID NO: 144.
- a GCGR-binding protein comprises a light chain variable region having at least about 85%, at least about 90%, at least about 95%, at least about 97%, or at least about 99% sequence identity to SEQ ID NO: 145. In some embodiments, a GCGR-binding protein comprises a heavy chain variable region having at least about 95% sequence identity to SEQ ID NO: 144 and/or a light chain variable region having at least about 95% sequence identity to SEQ ID NO: 145. In some embodiments, a GCGR-binding protein comprises a heavy chain variable region comprising SEQ ID NO: 144 and/or a light chain variable region comprising SEQ ID NO: 145.
- a GCGR-binding protein comprises a heavy chain variable region comprising SEQ ID NO: 144 and a light chain variable region comprising SEQ ID NO: 145. In some embodiments, a GCGR-binding protein comprises a heavy chain variable region consisting essentially of SEQ ID NO: 144 and a light chain variable region consisting essentially of SEQ ID NO: 145. In some embodiments, a GCGR-binding protein comprises a heavy chain variable region consisting of SEQ ID NO: 144 and a light chain variable region consisting of SEQ ID NO: 145.
- a GCGR-binding protein (e.g. , an antibody) comprises a heavy chain variable region having at least about 80% sequence identity to SEQ ID NO: 164 and/or a light chain variable region having at least 80% sequence identity to SEQ ID NO: 165. In some embodiments, a GCGR-binding protein comprises a heavy chain variable region having at least about 85%, at least about 90%, at least about 95%, at least about 97%, or at least about 99% sequence identity to SEQ ID NO: 164.
- a GCGR-binding protein comprises a light chain variable region having at least about 85%, at least about 90%, at least about 95%, at least about 97%, or at least about 99% sequence identity to SEQ ID NO: 165. In some embodiments, a GCGR-binding protein comprises a heavy chain variable region having at least about 95% sequence identity to SEQ ID NO: 164 and/or a light chain variable region having at least about 95% sequence identity to SEQ ID NO: 165. In some embodiments, a GCGR-binding protein comprises a heavy chain variable region comprising SEQ ID NO: 164 and/or a light chain variable region comprising SEQ ID NO: 165.
- a GCGR-binding protein comprises a heavy chain variable region comprising SEQ ID NO: 164 and a light chain variable region comprising SEQ ID NO: 165. In some embodiments, a GCGR-binding protein comprises a heavy chain variable region consisting essentially of SEQ ID NO: 164 and a light chain variable region consisting essentially of SEQ ID NO: 165. In some embodiments, a GCGR-binding protein comprises a heavy chain variable region consisting of SEQ ID NO: 164 and a light chain variable region consisting of SEQ ID NO: 165.
- a GCGR-binding protein (e.g. , an antibody) comprises a heavy chain variable region having at least about 80% sequence identity to SEQ ID NO: 188 and/or a light chain variable region having at least 80% sequence identity to SEQ ID NO: 189. In some embodiments, a GCGR-binding protein comprises a heavy chain variable region having at least about 85%, at least about 90%, at least about 95%, at least about 97%, or at least about 99% sequence identity to SEQ ID NO: 188.
- a GCGR-binding protein comprises a light chain variable region having at least about 85%, at least about 90%, at least about 95%, at least about 97%, or at least about 99% sequence identity to SEQ ID NO: 189. In some embodiments, a GCGR-binding protein comprises a heavy chain variable region having at least about 95% sequence identity to SEQ ID NO: 188 and/or a light chain variable region having at least about 95% sequence identity to SEQ ID NO: 189. In some embodiments, a GCGR-binding protein comprises a heavy chain variable region comprising SEQ ID NO: 188 and/or a light chain variable region comprising SEQ ID NO: 189.
- a GCGR-binding protein comprises a heavy chain variable region comprising SEQ ID NO: 188 and a light chain variable region comprising SEQ ID NO: 189. In some embodiments, a GCGR-binding protein comprises a heavy chain variable region consisting essentially of SEQ ID NO: 188 and a light chain variable region consisting essentially of SEQ ID NO: 189. In some embodiments, a GCGR-binding protein comprises a heavy chain variable region consisting of SEQ ID NO: 188 and a light chain variable region consisting of SEQ ID NO: 189.
- a GCGR-binding protein (e.g. , an antibody) comprises a heavy chain variable region having at least about 80% sequence identity to SEQ ID NO:203 and/or a light chain variable region having at least 80% sequence identity to SEQ ID NO:204.
- a GCGR-binding protein comprises a heavy chain variable region having at least about 85%, at least about 90%, at least about 95%, at least about 97%, or at least about 99% sequence identity to SEQ ID NO:203.
- a GCGR-binding protein comprises a light chain variable region having at least about 85%, at least about 90%, at least about 95%, at least about 97%, or at least about 99% sequence identity to SEQ ID NO: 204. In some embodiments, a GCGR-binding protein comprises a heavy chain variable region having at least about 95% sequence identity to SEQ ID NO:203 and/or a light chain variable region having at least about 95% sequence identity to SEQ ID NO:204. In some embodiments, a GCGR-binding protein comprises a heavy chain variable region comprising SEQ ID NO: 203 and/or a light chain variable region comprising SEQ ID NO: 204.
- a GCGR-binding protein comprises a heavy chain variable region comprising SEQ ID NO:203 and a light chain variable region comprising SEQ ID NO: 204. In some embodiments, a GCGR-binding protein comprises a heavy chain variable region consisting essentially of SEQ ID NO: 203 and a light chain variable region consisting essentially of SEQ ID NO:204. In some embodiments, a GCGR-binding protein comprises a heavy chain variable region consisting of SEQ ID NO: 203 and a light chain variable region consisting of SEQ ID NO:204.
- a GCGR-binding protein (e.g. , an antibody) comprises a heavy chain variable region having at least about 80% sequence identity to SEQ ID NO:218 and/or a light chain variable region having at least 80% sequence identity to SEQ ID NO:219. In some embodiments, a GCGR-binding protein comprises a heavy chain variable region having at least about 85%, at least about 90%, at least about 95%, at least about 97%, or at least about 99% sequence identity to SEQ ID NO:218.
- a GCGR-binding protein comprises a light chain variable region having at least about 85%, at least about 90%, at least about 95%, at least about 97%, or at least about 99% sequence identity to SEQ ID NO:219. In some embodiments, a GCGR-binding protein comprises a heavy chain variable region having at least about 95% sequence identity to SEQ ID NO:218 and/or a light chain variable region having at least about 95% sequence identity to SEQ ID NO:219. In some embodiments, a GCGR-binding protein comprises a heavy chain variable region comprising SEQ ID NO:218 and/or a light chain variable region comprising SEQ ID NO:219.
- a GCGR-binding protein comprises a heavy chain variable region comprising SEQ ID NO:218 and a light chain variable region comprising SEQ ID NO:219. In some embodiments, a GCGR-binding protein comprises a heavy chain variable region consisting essentially of SEQ ID NO:218 and a light chain variable region consisting essentially of SEQ ID NO:219. In some embodiments, a GCGR-binding protein comprises a heavy chain variable region consisting of SEQ ID NO:218 and a light chain variable region consisting of SEQ ID NO:219.
- a GCGR-binding protein is a humanized version of any one of the antibodies disclosed herein.
- a GCGR-binding protein is a humanized version of the antibody 6B5, 3H5, 5B 1 1, 1C1, 1C3, 1H2, 4F8, 13G9, 14F4, or 14E9.
- a GCGR-binding protein is a humanized version of the antibody 6B5, for example, Hz6B5.
- a GCGR-binding protein e.g.
- an antibody comprises a heavy chain variable region having at least about 80% sequence identity to SEQ ID NO:220 and/or a light chain variable region having at least 80% sequence identity to SEQ ID NO:221.
- a GCGR-binding protein comprises a heavy chain variable region having at least about 85%, at least about 90%, at least about 95%, at least about 97%, or at least about 99% sequence identity to SEQ ID NO:220.
- a GCGR-binding protein comprises a light chain variable region having at least about 85%, at least about 90%, at least about 95%, at least about 97%, or at least about 99% sequence identity to SEQ ID NO: 221.
- a GCGR-binding protein comprises a heavy chain variable region having at least about 95% sequence identity to SEQ ID NO:220 and/or a light chain variable region having at least about 95% sequence identity to SEQ ID NO:221. In some embodiments, a GCGR-binding protein comprises a heavy chain variable region comprising SEQ ID NO: 220 and/or a light chain variable region comprising SEQ ID NO:221. In some embodiments, a GCGR-binding protein comprises a heavy chain variable region comprising SEQ ID NO: 220 and a light chain variable region comprising SEQ ID NO: 221.
- a GCGR-binding protein comprises a heavy chain variable region consisting essentially of SEQ ID NO:220 and a light chain variable region consisting essentially of SEQ ID NO: 221. In some embodiments, a GCGR-binding protein comprises a heavy chain variable region consisting of SEQ ID NO: 220 and a light chain variable region consisting of SEQ ID NO: 221. In some embodiments, a GCGR-binding protein is a humanized antibody comprising a heavy chain variable region comprising SEQ ID NO:220 and a light chain variable region comprising SEQ ID NO:221.
- antibodies may be any binding agents.
- Epitope binning is based on competitive immunoassays to characterize a set of antibodies against a target protein. Each antibody is screened against all of the other antibodies in the set for binding to the target in a pairwise fashion to determine if a first antibody blocks a second antibody from binding to the target. After screening, each antibody has a profile created based on the competitive assay results. Antibodies with similar profiles (e.g., they block or do not block similar antibodies) are "binned" together and are considered to bind the same epitope, a closely related epitope, or an overlapping epitope. In some embodiments, antibodies that specifically bind GCGR are sorted into an "epitope bin".
- an antibody is sorted into the epitope bin of the antibodies described herein. In some embodiments, an antibody is sorted into an epitope bin comprising at least one antibody from the group consisting of: 6B5, 3H5, 5B 1 1, 1C 1, 1C3, 1H2, 4F8, 13G9, 14F4, and 14E9.
- alternative GCGR-binding proteins e.g. , antibodies
- a GCGR- binding protein e.g. , an antibody
- a GCGR-binding protein binds the same epitope as one of the antibodies described herein.
- a GCGR-binding protein e.g. , an antibody
- a GCGR-binding protein (e.g., an antibody) competes with an antibody comprising one, two, three, four, five, or all six CDRs from an antibody defined in Tables 1- 10.
- a GCGR-binding protein (e.g. , an antibody) competes with an antibody comprising a heavy chain variable region and a light chain variable region selected from those provided in Tables 1-10.
- a GCGR-binding protein (e.g., an antibody) competes for binding to GCGR with an anti-GCGR antibody described herein.
- a GCGR-binding protein (e.g., an antibody) competes for binding to GCGR with an anti-GCGR antibody described herein.
- a GCGR-binding protein (e.g., an antibody) competes for binding to GCGR with an anti-GCGR antibody described herein.
- an antibody competes for binding to GCGR with a reference antibody
- the reference antibody comprises: (a) a heavy chain CDRl comprising GFTFTNHWLG (SEQ ID NO: 1); a heavy chain CDR2 comprising DIYPGGYYINYNEKFKG (SEQ ID NO:2); and a heavy chain CDR3 comprising HTNYGSDY (SEQ ID NO:3); and (b) a light chain CDRl comprising RSSQSIVDSYGNTFLE (SEQ ID NO:4); a light chain CDR2 comprising KVSNRLS (SEQ ID NO:5); and a light chain CDR3 comprising FQGSHVPWT (SEQ ID NO:6).
- a GCGR-binding protein (e.g. , an antibody) competes for binding to GCGR with a reference antibody, wherein the reference antibody comprises a heavy chain CDRl comprising SEQ ID NO:27; a heavy chain CDR2 comprising SEQ ID NO:28; a heavy chain CDR3 comprising SEQ ID NO:29; a light chain CDRl comprising SEQ ID NO:30; a light chain CDR2 comprising SEQ ID NO:31 ; and a light chain CDR3 comprising SEQ ID NO:32.
- a GCGR-binding protein (e.g., an antibody) competes for binding to GCGR with a reference antibody, wherein the reference antibody comprises a heavy chain CDRl comprising SEQ ID NO:27; a heavy chain CDR2 comprising SEQ ID NO:28; a heavy chain CDR3 comprising SEQ ID NO:29; a light chain CDRl comprising SEQ ID NO:30; a light chain CDR2 comprising SEQ ID NO
- an antibody competes for binding to GCGR with a reference antibody, wherein the reference antibody comprises a heavy chain CDRl comprising SEQ ID NO:53; a heavy chain CDR2 comprising SEQ ID NO:54; a heavy chain CDR3 comprising SEQ ID NO:55; a light chain CDRl comprising SEQ ID NO:56; a light chain CDR2 comprising SEQ ID NO:31 ; and a light chain CDR3 comprising SEQ ID NO:32.
- a GCGR-binding protein e.g.
- an antibody competes for binding to GCGR with a reference antibody, wherein the reference antibody comprises a heavy chain CDRl comprising SEQ ID NO:73; a heavy chain CDR2 comprising SEQ ID NO:74; a heavy chain CDR3 comprising SEQ ID NO:75; a light chain CDRl comprising SEQ ID NO:76; a light chain CDR2 comprising SEQ ID NO:77; and a light chain CDR3 comprising SEQ ID NO:78.
- a GCGR-binding protein e.g.
- an antibody competes for binding to GCGR with a reference antibody, wherein the reference antibody comprises a heavy chain CDRl comprising SEQ ID NO:99; a heavy chain CDR2 comprising SEQ ID NO: 100; a heavy chain CDR3 comprising SEQ ID NO: 101; a light chain CDRl comprising SEQ ID NO: 102; a light chain CDR2 comprising SEQ ID NO: 103; and a light chain CDR3 comprising SEQ ID NO: 104.
- the reference antibody comprises a heavy chain CDRl comprising SEQ ID NO:99; a heavy chain CDR2 comprising SEQ ID NO: 100; a heavy chain CDR3 comprising SEQ ID NO: 101; a light chain CDRl comprising SEQ ID NO: 102; a light chain CDR2 comprising SEQ ID NO: 103; and a light chain CDR3 comprising SEQ ID NO: 104.
- a GCGR-binding protein (e.g. , an antibody) competes for binding to GCGR with a reference antibody, wherein the reference antibody comprises a heavy chain CDRl comprising SEQ ID NO: 124; a heavy chain CDR2 comprising SEQ ID NO: 125; a heavy chain CDR3 comprising SEQ ID NO: 126; a light chain CDRl comprising SEQ ID NO: 127; a light chain CDR2 comprising SEQ ID NO: 128; and a light chain CDR3 comprising SEQ ID NO:6.
- the reference antibody comprises a heavy chain CDRl comprising SEQ ID NO: 124; a heavy chain CDR2 comprising SEQ ID NO: 125; a heavy chain CDR3 comprising SEQ ID NO: 126; a light chain CDRl comprising SEQ ID NO: 127; a light chain CDR2 comprising SEQ ID NO: 128; and a light chain CDR3 comprising SEQ ID NO:6.
- a GCGR-binding protein (e.g., an antibody) competes for binding to GCGR with a reference antibody, wherein the reference antibody comprises a heavy chain CDRl comprising SEQ ID NO: 146; a heavy chain CDR2 comprising SEQ ID NO: 147; a heavy chain CDR3 comprising SEQ ID NO: 148; a light chain CDRl comprising SEQ ID NO: 149; a light chain CDR2 comprising SEQ ID NO: 128; and a light chain CDR3 comprising SEQ ID NO:6.
- a GCGR-binding protein (e.g., an antibody) competes for binding to GCGR with a reference antibody, wherein the reference antibody comprises a heavy chain CDRl comprising SEQ ID NO: 146; a heavy chain CDR2 comprising SEQ ID NO: 147; a heavy chain CDR3 comprising SEQ ID NO: 148; a light chain CDRl comprising SEQ ID NO: 149; a light chain CDR
- an antibody competes for binding to GCGR with a reference antibody, wherein the reference antibody comprises a heavy chain CDRl comprising SEQ ID NO: 166; a heavy chain CDR2 comprising SEQ ID NO: 167; a heavy chain CDR3 comprising SEQ ID NO: 168; a light chain CDRl comprising SEQ ID NO: 169; a light chain CDR2 comprising SEQ ID NO: 170; and a light chain CDR3 comprising SEQ ID NO: 171.
- the reference antibody comprises a heavy chain CDRl comprising SEQ ID NO: 166; a heavy chain CDR2 comprising SEQ ID NO: 167; a heavy chain CDR3 comprising SEQ ID NO: 168; a light chain CDRl comprising SEQ ID NO: 169; a light chain CDR2 comprising SEQ ID NO: 170; and a light chain CDR3 comprising SEQ ID NO: 171.
- the reference antibody comprises a heavy chain CDRl comprising SEQ ID NO: 166
- a GCGR-binding protein (e.g. , an antibody) competes for binding to GCGR with a reference antibody, wherein the reference antibody comprises a heavy chain CDRl comprising SEQ ID NO: 190; a heavy chain CDR2 comprising SEQ ID NO: 191 ; a heavy chain CDR3 comprising SEQ ID NO: 192; a light chain CDRl comprising SEQ ID NO: 169; a light chain CDR2 comprising SEQ ID NO: 128; and a light chain CDR3 comprising SEQ ID NO: 193.
- the reference antibody comprises a heavy chain CDRl comprising SEQ ID NO: 190; a heavy chain CDR2 comprising SEQ ID NO: 191 ; a heavy chain CDR3 comprising SEQ ID NO: 192; a light chain CDRl comprising SEQ ID NO: 169; a light chain CDR2 comprising SEQ ID NO: 128; and a light chain CDR3 comprising SEQ ID NO: 193.
- a GCGR-binding protein (e.g., an antibody) competes for binding to GCGR with a reference antibody, wherein the reference antibody comprises a heavy chain CDRl comprising SEQ ID NO: 190; a heavy chain CDR2 comprising SEQ ID NO:205; a heavy chain CDR3 comprising SEQ ID NO:206; a light chain CDRl comprising SEQ ID NO:207; a light chain CDR2 comprising SEQ ID NO: 128; and a light chain CDR3 comprising SEQ ID NO:6.
- the reference antibody comprises a heavy chain CDRl comprising SEQ ID NO: 190; a heavy chain CDR2 comprising SEQ ID NO:205; a heavy chain CDR3 comprising SEQ ID NO:206; a light chain CDRl comprising SEQ ID NO:207; a light chain CDR2 comprising SEQ ID NO: 128; and a light chain CDR3 comprising SEQ ID NO:6.
- a GCGR-binding protein (e.g., antibody) competes for binding to GCGR with a reference antibody, wherein the reference antibody comprises (a) a heavy chain variable region comprising SEQ ID NO:25 and a light chain variable region comprising SEQ ID NO:26; (b) a heavy chain variable region comprising SEQ ID NO: 220 and a light chain variable region comprising SEQ ID NO:221 ; (c) a heavy chain variable region comprising SEQ ID NO: 51 and a light chain variable region comprising SEQ ID NO:52; (d) a heavy chain variable region comprising SEQ ID NO:71 and a light chain variable region comprising SEQ ID NO:72; (e) a heavy chain variable region comprising SEQ ID NO:97 and a light chain variable region comprising SEQ ID NO:98; (f) a heavy chain variable region comprising SEQ ID NO: 122 and a light chain variable region comprising SEQ ID NO: 123; (g) a heavy chain variable region comprising SEQ ID
- the GCGR-binding proteins described herein comprise antibodies (e.g. , full-length antibodies) in which at least one or more of the constant regions has been modified or deleted.
- the antibodies may comprise modifications to one or more of the three heavy chain constant regions (CHI, CH2 or CH3) and/or to the light chain constant region (CL).
- the heavy chain constant region of the modified antibodies comprises at least one human constant region.
- the heavy chain constant region of the modified antibodies comprises more than one human constant region.
- modifications to the constant region comprise additions, deletions, or substitutions of one or more amino acids in one or more regions.
- one or more regions are partially or entirely deleted from the constant regions of the modified antibodies.
- a deleted constant region is replaced by a short amino acid spacer that provides some of the molecular flexibility typically imparted by the absent constant region.
- a modified antibody comprises a CH3 domain directly fused to the hinge region of the antibody.
- a modified antibody comprises a peptide spacer inserted between the hinge region and modified CH2 and/or CH3 domains.
- the constant region(s) of an antibody mediates several effector functions. For example, binding of the CI component of complement to the Fc region of IgG or IgM antibodies (bound to antigen) activates the complement system. Activation of complement is important in the opsonization and lysis of cell pathogens. The activation of complement also stimulates the inflammatory response and can be involved in autoimmune hypersensitivity.
- the Fc region of an antibody can bind a cell expressing a Fc receptor (FcR).
- Fc receptors that are specific for different classes of antibody, including IgG (gamma receptors), IgE (epsilon receptors), IgA (alpha receptors) and IgM (mu receptors). Binding of antibody to Fc receptors on cell surfaces triggers a number of important and diverse biological responses including engulfment and destruction of antibody- coated particles, clearance of immune complexes, lysis of antibody-coated target cells by killer cells (called antibody -dependent cell cytotoxicity or ADCC), release of inflammatory mediators, placental transfer, and control of immunoglobulin production.
- IgG gamma receptors
- IgE epsilon receptors
- IgA alpha receptors
- IgM mi receptors
- an antibody comprises a variant Fc region.
- the amino acid sequences of the Fc region of human IgGl, IgG2, IgG3, and IgG4 are known to those of ordinary skill in the art (e.g. , human IgGl - SEQ ID NO:230). Fc regions with amino acid variations have been identified in native antibodies.
- a variant Fc region is engineered with substitutions at specific amino acid positions as compared to a native Fc region (e.g. , SEQ ID NO:231 and SEQ ID NO:232).
- the modified antibodies provide for altered effector functions that, in turn, affect the biological profile of the administered antibody.
- the deletion or inactivation (through point mutations or other means) of a constant region may reduce Fc receptor binding of the circulating modified antibody.
- the constant region modifications increase the serum half-life of the antibody.
- the constant region modifications reduce the serum half-life of the antibody.
- the constant region modifications enhance or increase ADCC and/or complement-dependent cytotoxicity (CDC) of the antibody.
- the constant region modifications decrease or remove ADCC and/or CDC of the antibody.
- an antibody does not have one or more effector functions.
- the antibody has no ADCC activity and/or no CDC activity.
- the antibody does not bind an Fc receptor and/or complement factors.
- the antibody has no effector function(s).
- the constant region is modified to eliminate disulfide linkages or oligosaccharide moieties.
- the constant region is modified to add/substitute one or more amino acids to provide, for example, one or more cytotoxin or carbohydrate attachment sites.
- antibody variants can be prepared by introducing appropriate nucleotide changes into the encoding DNA, and/or by synthesis of the desired antibody or polypeptide.
- the present disclosure further embraces additional variants and equivalents that are substantially homologous to the recombinant, monoclonal, chimeric, humanized, and human antibodies, or antibody fragments thereof, described herein.
- it may be desirable to improve the binding affinity of the antibody.
- it may be desirable to modulate other biological properties of the antibody, including but not limited to, specificity, thermostability, expression level, effector function(s), glycosylation, immunogenicity, and/or solubility.
- some amino acid changes may alter post-translational modifications of an antibody, such as changing the number or position of glycosylation sites or altering membrane anchoring characteristics.
- Variations may be a substitution, deletion, or insertion of one or more nucleotides encoding the antibody or polypeptide that results in a change in the amino acid sequence as compared with the native antibody or polypeptide sequence.
- Amino acid substitutions can be the result of replacing one amino acid with another amino acid having similar structural and/or chemical properties, such as the replacement of a leucine with a serine, e.g., conservative amino acid replacements.
- Insertions or deletions may optionally be in the range of about 1 to 5 amino acids.
- the substitution, deletion, or insertion comprises less than 25 amino acid substitutions, less than 20 amino acid substitutions, less than 15 amino acid substitutions, less than 10 amino acid substitutions, less than 5 amino acid substitutions, less than 4 amino acid substitutions, less than 3 amino acid substitutions, or less than 2 amino acid substitutions relative to the parent molecule.
- Variations in the amino acid sequence that are biologically useful and/or relevant may be determined by systematically making insertions, deletions, or substitutions in the sequence and testing the resulting variant proteins for activity as compared to the parental protein.
- variants may include addition of amino acid residues at the amino- and/or carboxyl-terminal end of the antibody or polypeptide.
- the length of additional amino acids residues may range from one residue to a hundred or more residues.
- a variant comprises an N-terminal methionyl residue.
- the variant comprises an additional polypeptide/protein, i.e. , a fusion protein.
- a variant comprises a detectable label and/or protein (e.g. , an enzyme).
- a cysteine residue not involved in maintaining the proper conformation of an antibody may be substituted or deleted to modulate the antibody's characteristics, for example, to improve oxidative stability and/or prevent aberrant disulfide crosslinking.
- one or more cysteine residues may be added to create disulfide bond(s) to improve stability.
- an antibody of the present disclosure is "deimmunized".
- the deimmunization of antibodies generally consists of introducing specific amino acid mutations (e.g. , substitutions, deletions, additions) to remove T-cell epitopes without significantly reducing the binding affinity or other desired activities of the antibody.
- variant antibodies or polypeptides described herein may be generated using methods known in the art, including but not limited to, site-directed mutagenesis, alanine scanning mutagenesis, and PCR mutagenesis.
- a GCGR-binding protein described herein is chemically modified.
- a binding protein is an antibody that has been chemically modified by glycosylation, acetylation, pegylation, phosphorylation, amidation, derivatization by known protecting/blocking groups, proteolytic cleavage, and/or linkage to another protein. Any of numerous chemical modifications may be carried out by known techniques.
- the present disclosure encompasses binding proteins built upon non-immunoglobulin backbones, wherein the proteins bind to the same epitope or essentially the same epitope as an anti- GCGR antibody disclosed herein.
- a non-immunoglobulin-based binding protein is a protein that competes with an anti-GCGR antibody described herein in a competitive binding assay.
- an alternative binding protein comprises a scaffold protein.
- scaffold proteins can be assigned to one of three groups based on the architecture of their backbone: (1) scaffolds consisting of a-helices; (2) small scaffolds with few secondary structures or an irregular architecture of a- helices and ⁇ -sheets; and (3) scaffolds consisting of predominantly ⁇ -sheets.
- Scaffold proteins include, but are not limited to, anticalins, which are based upon the lipocalin scaffold; adnectins, which are based on the 10 th domain of human fibronectin type 3; affibodies, which are based on the B-domain in the Ig- binding region of Staphylococcus aureus protein A; darpins, which are based on ankyrin repeat domain proteins; fynomers, which are based on the SH3 domain of the human Fyn protein kinase; affitins, which are based on Sac7d from Sulfolobus acidocaldarius; affilins, which are based on human ⁇ - ⁇ -crystallin or human ubiquitin; avimers, which are based on the A-domains of membrane receptor proteins; knottins (cysteine knot miniproteins), which are based upon a stable 30-amino acid anti -parallel ⁇ -strand protein fold; and Kunitz domain
- a GCGR-binding protein comprises an engineered scaffold protein comprising one or more CDRs from an antibody defined in Tables 1-10. In some embodiments, a GCGR-binding protein comprises an engineered scaffold protein comprising the Exemplary heavy CDRl, CDR2, and CD3 and the Exemplary light chain CDRl, CDR2, and CDR3 from Table 1. In some embodiments, a GCGR-binding protein comprises an engineered scaffold protein comprising the Kabat heavy CDRl, CDR2, and CD3 and the Kabat light chain CDRl, CDR2, and CDR3 from Table 1.
- a GCGR-binding protein comprises an engineered scaffold protein comprising the Chothia heavy CDRl, CDR2, and CD3 and the Chothia light chain CDRl, CDR2, and CDR3 from Table 1.
- a GCGR-binding protein comprises an engineered scaffold protein comprising the Exemplary heavy CDRl, CDR2, and CD3 and the Exemplary light chain CDRl, CDR2, and CDR3 from Table 2.
- a GCGR-binding protein comprises an engineered scaffold protein comprising the Kabat heavy CDRl, CDR2, and CD3 and the Kabat light chain CDRl, CDR2, and CDR3 from Table 2.
- a GCGR-binding protein comprises an engineered scaffold protein comprising the Chothia heavy CDRl, CDR2, and CD3 and the Chothia light chain CDRl, CDR2, and CDR3 from Table 2.
- a GCGR-binding protein comprises an engineered scaffold protein comprising the Exemplary heavy CDRl, CDR2, and CD3 and the Exemplary light chain CDRl, CDR2, and CDR3 from Table 3.
- a GCGR-binding protein comprises an engineered scaffold protein comprising the Kabat heavy CDRl, CDR2, and CD3 and the Kabat light chain CDRl, CDR2, and CDR3 from Table 3.
- a GCGR-binding protein comprises an engineered scaffold protein comprising the Chothia heavy CDRl, CDR2, and CD3 and the Chothia light chain CDRl, CDR2, and CDR3 from Table 3.
- a GCGR-binding protein comprises an engineered scaffold protein comprising the Exemplary heavy CDRl, CDR2, and CD3 and the Exemplary light chain CDRl, CDR2, and CDR3 from Table 4.
- a GCGR-binding protein comprises an engineered scaffold protein comprising the Kabat heavy CDRl, CDR2, and CD3 and the Kabat light chain CDRl, CDR2, and CDR3 from Table 4.
- a GCGR-binding protein comprises an engineered scaffold protein comprising the Chothia heavy CDRl, CDR2, and CD3 and the Chothia light chain CDRl, CDR2, and CDR3 from Table 4. In some embodiments, a GCGR-binding protein comprises an engineered scaffold protein comprising the Exemplary heavy CDRl, CDR2, and CD3 and the Exemplary light chain CDRl, CDR2, and CDR3 from Table 5. In some embodiments, a GCGR-binding protein comprises an engineered scaffold protein comprising the Kabat heavy CDRl, CDR2, and CD3 and the Kabat light chain CDRl, CDR2, and CDR3 from Table 5.
- a GCGR-binding protein comprises an engineered scaffold protein comprising the Chothia heavy CDRl, CDR2, and CD3 and the Chothia light chain CDRl, CDR2, and CDR3 from Table 5. In some embodiments, a GCGR-binding protein comprises an engineered scaffold protein comprising the Exemplary heavy CDRl, CDR2, and CD3 and the Exemplary light chain CDRl, CDR2, and CDR3 from Table 6. In some embodiments, a GCGR-binding protein comprises an engineered scaffold protein comprising the Kabat heavy CDRl, CDR2, and CD3 and the Kabat light chain CDRl, CDR2, and CDR3 from Table 6.
- a GCGR-binding protein comprises an engineered scaffold protein comprising the Chothia heavy CDRl, CDR2, and CD3 and the Chothia light chain CDRl, CDR2, and CDR3 from Table 6. In some embodiments, a GCGR-binding protein comprises an engineered scaffold protein comprising the Exemplary heavy CDRl, CDR2, and CD3 and the Exemplary light chain CDRl, CDR2, and CDR3 from Table 7. In some embodiments, a GCGR-binding protein comprises an engineered scaffold protein comprising the Kabat heavy CDRl, CDR2, and CD3 and the Kabat light chain CDRl, CDR2, and CDR3 from Table 7.
- a GCGR-binding protein comprises an engineered scaffold protein comprising the Chothia heavy CDRl, CDR2, and CD3 and the Chothia light chain CDRl, CDR2, and CDR3 from Table 7. In some embodiments, a GCGR-binding protein comprises an engineered scaffold protein comprising the Exemplary heavy CDRl, CDR2, and CD3 and the Exemplary light chain CDRl, CDR2, and CDR3 from Table 8. In some embodiments, a GCGR-binding protein comprises an engineered scaffold protein comprising the Kabat heavy CDRl, CDR2, and CD3 and the Kabat light chain CDRl, CDR2, and CDR3 from Table 8.
- a GCGR-binding protein comprises an engineered scaffold protein comprising the Chothia heavy CDR1, CDR2, and CD3 and the Chothia light chain CDR1, CDR2, and CDR3 from Table 8. In some embodiments, a GCGR-binding protein comprises an engineered scaffold protein comprising the Exemplary heavy CDR1, CDR2, and CD3 and the Exemplary light chain CDR1, CDR2, and CDR3 from Table 9. In some embodiments, a GCGR-binding protein comprises an engineered scaffold protein comprising the Kabat heavy CDR1, CDR2, and CD3 and the Kabat light chain CDR1, CDR2, and CDR3 from Table 9.
- a GCGR-binding protein comprises an engineered scaffold protein comprising the Chothia heavy CDR1, CDR2, and CD3 and the Chothia light chain CDR1, CDR2, and CDR3 from Table 9. In some embodiments, a GCGR-binding protein comprises an engineered scaffold protein comprising the Exemplary heavy CDR1, CDR2, and CD3 and the Exemplary light chain CDR1, CDR2, and CDR3 from Table 10. In some embodiments, a GCGR-binding protein comprises an engineered scaffold protein comprising the Kabat heavy CDR1, CDR2, and CD3 and the Kabat light chain CDR1, CDR2, and CDR3 from Table 10.
- a GCGR-binding protein comprises an engineered scaffold protein comprising the Chothia heavy CDR1, CDR2, and CD3 and the Chothia light chain CDR1, CDR2, and CDR3 from Table 10. In some embodiments, a GCGR-binding protein comprises an engineered scaffold protein comprising the six CDRs of antibody 6B5, 3H5, 5B 1 1, 1C 1, 1C3, 1H2, 4F8, 13G9, 14F4, or 14E9,
- KD is the ratio of an antibody dissociation rate (k 0 ff) (how quickly it dissociates from its antigen) to the antibody association rate (k on ) (how quickly it binds to its antigen).
- KD values are determined by measuring the k on and k 0 ff rates of a specific antibody/antigen interaction and then using a ratio of these values to calculate the KD value.
- KD values may be used to evaluate and rank order the strength of individual antibody/antigen interactions. The lower the KD of an antibody, the higher the affinity of the antibody for its target. Avidity gives a measure of the overall strength of an antibody-antigen complex. It is dependent on three major parameters: (i) affinity of the antibody for the epitope, (ii) valency of both the antibody and antigen, and (iii) structural arrangement of the parts that interact.
- a GCGR-binding protein (e.g., an antibody) binds GCGR with a dissociation constant (KD) of about 1 ⁇ or less, about 100 nM or less, about 40 nM or less, about 20 nM or less, about 10 nM or less, about 1 nM or less, about 0.1 nM or less, 50 pM or less, 10 pM or less, or 1 pM or less.
- KD dissociation constant
- a GCGR-binding protein binds GCGR with a KD of about 20 nM or less.
- a GCGR-binding protein binds GCGR with a KD of about 10 nM or less.
- a GCGR-binding protein binds GCGR with a KD of about 1 nM or less. In some embodiments, a GCGR-binding protein binds GCGR with a KD of about 0.5 nM or less. In some embodiments, a GCGR-binding protein binds GCGR with a KD of about 0.1 nM or less. In some embodiments, a GCGR-binding protein binds GCGR with a KD of about 50 pM or less. In some embodiments, a GCGR-binding protein binds GCGR with a KD of about 25 pM or less.
- a GCGR-binding protein binds GCGR with a KD of about 10 pM or less. In some embodiments, a GCGR-binding protein binds GCGR with a KD of about 1 pM or less.
- the dissociation constant of the binding protein (e.g., an antibody) to GCGR is the dissociation constant determined using a GCGR fusion protein comprising at least a portion or fragment of GCGR immobilized on a Biacore chip.
- the dissociation constant of the binding protein (e.g., an antibody) to GCGR is the dissociation constant determined using the extracellular domain of GCGR (or a portion/fragment of the extracellular domain) immobilized on a Biacore chip.
- the dissociation constant of the binding protein (e.g. , an antibody) to GCGR is the dissociation constant determined using the binding protein captured by an anti-human IgG antibody on a Biacore chip and soluble GCGR or a fragment thereof.
- a GCGR-binding protein (e.g., an antibody) binds GCGR with a half maximal effective concentration (EC50) of about 1 ⁇ or less, about 100 nM or less, about 40 nM or less, about 20 nM or less, about 10 nM or less, about 1 nM or less, or about 0.1 nM or less.
- a GCGR-binding protein binds to human GCGR with an EC50 of about 1 ⁇ or less, about 100 nM or less, about 40 nM or less, about 20 nM or less, about 10 nM or less, about 1 nM or less, or about 0.1 nM or less.
- a GCGR-binding protein binds mouse GCGR and/or human GCGR with an EC50 of about 40 nM or less, about 20 nM or less, about 10 nM or less, about 1 nM or less or about 0.1 nM or less.
- the binding proteins (e.g. , antibodies) described herein can be produced by any suitable method known in the art. Such methods range from direct protein synthesis methods to constructing a DNA sequence encoding polypeptide sequences and expressing those sequences in a suitable host.
- a DNA sequence is constructed using recombinant technology by isolating or synthesizing a DNA sequence encoding a wild-type protein of interest.
- the sequence can be mutagenized by site-specific mutagenesis to provide functional variants thereof.
- a DNA sequence encoding a polypeptide of interest is constructed by chemical synthesis using an oligonucleotide synthesizer.
- Oligonucleotides can be designed based on the amino acid sequence of the desired polypeptide and selecting those codons that are favored in the host cell in which the recombinant polypeptide of interest will be produced. Standard methods can be applied to synthesize a polynucleotide sequence encoding an isolated polypeptide of interest. For example, a complete amino acid sequence can be used to construct a back-translated gene. Further, a DNA oligomer containing a nucleotide sequence coding for the particular isolated polypeptide can be synthesized. For example, several small oligonucleotides coding for portions of the desired polypeptide can be synthesized and then ligated. The individual oligonucleotides typically contain 5' or 3' overhangs for complementary assembly.
- polynucleotide sequences encoding a particular polypeptide of interest can be inserted into an expression vector and operatively linked to an expression control sequence appropriate for expression of the protein in a desired host. Proper assembly can be confirmed by nucleotide sequencing, restriction enzyme mapping, and/or expression of a biologically active polypeptide in a suitable host. As is well-known to those of skill in the art, in order to obtain high expression levels of a transfected gene in a host, the gene must be operatively linked to transcriptional and translational expression control sequences that are functional in the chosen expression host.
- recombinant expression vectors are used to amplify and express DNA encoding antibodies, or fragments thereof, against human GCGR.
- recombinant expression vectors can be replicable DNA constructs which have synthetic or cDNA-derived DNA fragments encoding a polypeptide chain of a GCGR-binding protein, such as an anti-GCGR antibody, or an antigen- binding fragment thereof, operatively linked to suitable transcriptional and/or translational regulatory elements derived from mammalian, microbial, viral, or insect genes.
- a transcriptional unit generally comprises an assembly of (1) a genetic element or elements having a regulatory role in gene expression, for example, transcriptional promoters or enhancers, (2) a structural or coding sequence which is transcribed into mRNA and translated into protein, and (3) appropriate transcription and translation initiation and termination sequences. Regulatory elements can include an operator sequence to control transcription. The ability to replicate in a host, usually conferred by an origin of replication, and a selection gene to facilitate recognition of transformants can additionally be incorporated. DNA regions are "operatively linked" when they are functionally related to each other.
- DNA for a signal peptide is operatively linked to DNA for a polypeptide if it is expressed as a precursor which participates in the secretion of the polypeptide; a promoter is operatively linked to a coding sequence if it controls the transcription of the sequence; or a ribosome binding site is operatively linked to a coding sequence if it is positioned so as to permit translation.
- structural elements intended for use in yeast expression systems include a leader sequence enabling extracellular secretion of translated protein by a host cell.
- a polypeptide may include an N-terminal methionine residue. This residue can optionally be subsequently cleaved from the expressed recombinant protein to provide a final product.
- Useful expression vectors for eukaryotic hosts include, for example, vectors comprising expression control sequences from SV40, bovine papilloma virus, adenovirus, and cytomegalovirus.
- Useful expression vectors for bacterial hosts include known bacterial plasmids, such as plasmids from E. coli, including pCRl, pBR322, pMB9 and their derivatives, and wider host range plasmids, such as M13 and other filamentous single-stranded DNA phages.
- the GCGR-binding proteins (e.g., antibodies) of the present disclosure can be expressed from one or more vectors.
- a heavy chain polypeptide is expressed by one vector and a light chain polypeptide is expressed by a second vector.
- a heavy chain polypeptide and a light chain polypeptide are expressed by one vector.
- Suitable host cells for expression of a GCGR-binding protein (e.g., an antibody) or a GCGR protein or fragment thereof to use as an antigen or immunogen include prokaryotes, yeast cells, insect cells, or higher eukaryotic cells under the control of appropriate promoters.
- Prokaryotes include gram- negative or gram-positive organisms, for example, E. coli or Bacillus.
- Higher eukaryotic cells include established cell lines of mammalian origin as described herein. Cell-free translation systems may also be employed.
- Appropriate cloning and expression vectors for use with bacterial, fungal, yeast, and mammalian cellular hosts, as well as methods of protein production, including antibody production are well known in the art.
- mammalian host cell lines include, but are not limited to, COS-7 (monkey kidney-derived), L-929 (murine fibroblast-derived), C127 (murine mammary tumor-derived), 3T3 (murine fibroblast-derived), CHO (Chinese hamster ovary -derived), HeLa (human cervical cancer-derived), BHK (hamster kidney fibroblast-derived), HEK-293 (human embryonic kidney-derived) cell lines and variants thereof.
- Mammalian expression vectors can comprise non-transcribed elements such as an origin of replication, a suitable promoter and enhancer linked to the gene to be expressed, and other 5' or 3' flanking non- transcribed sequences, and 5' or 3' non-translated sequences, such as necessary ribosome binding sites, a polyadenylation site, splice donor and acceptor sites, and transcriptional termination sequences.
- non-transcribed elements such as an origin of replication, a suitable promoter and enhancer linked to the gene to be expressed, and other 5' or 3' flanking non- transcribed sequences, and 5' or 3' non-translated sequences, such as necessary ribosome binding sites, a polyadenylation site, splice donor and acceptor sites, and transcriptional termination sequences.
- expression of recombinant proteins in insect cell culture systems e.g. , baculovirus
- Baculovirus systems for production of heterologous proteins in insect cells are well known to those of skill in the art.
- the present disclosure provides cells comprising the GCGR-binding proteins described herein.
- the cells produce the GCGR-binding proteins described herein.
- the cells produce an antibody.
- the cells produce an antibody that binds human GCGR.
- the cells produce an antibody that binds cyno GCGR.
- the cells produce an antibody that binds human GCGR and cyno GCGR.
- the cells produce an antibody designated 6B5, 3H5, 5B 11, 1C 1, 1C3, 1H2, 4F8, 13G9, 14F4, or 14E9.
- the cells produce an antibody designated 6B5.
- the cells produce a humanized version of antibody 6B5, referred to as Hz6B5.
- the cell is a hybridoma cell.
- the cell is a mammalian cell.
- the cell is a prokaryotic cell.
- the cell is an eukaryotic cell.
- Proteins produced by a host cell can be purified according to any suitable method.
- Standard methods include chromatography (e.g., ion exchange, affinity, and sizing column chromatography), centrifugation, differential solubility, or by any other standard technique for protein purification.
- Affinity tags such as hexa-histidine, maltose binding domain, influenza coat sequence, and glutathione-S- transferase can be attached to the protein to allow easy purification by passage over an appropriate affinity column.
- Affinity chromatography used for purifying immunoglobulins can include Protein A, Protein G, and Protein L chromatography.
- Isolated proteins can be physically characterized using such techniques as proteolysis, size exclusion chromatography (SEC), mass spectrometry (MS), nuclear magnetic resonance (NMR), isoelectric focusing (IEF), high performance liquid chromatography (HPLC), and x-ray crystallography.
- SEC size exclusion chromatography
- MS mass spectrometry
- NMR nuclear magnetic resonance
- IEF isoelectric focusing
- HPLC high performance liquid chromatography
- x-ray crystallography x-ray crystallography
- supernatants from expression systems that secrete recombinant protein into culture media are first concentrated using a commercially available protein concentration filter, for example, an Amicon® or Millipore Pellicon® ultrafiltration unit. Following the concentration step, the concentrate can be applied to a suitable purification matrix.
- a suitable purification matrix for example, an anion exchange resin is employed, for example, a matrix or substrate having pendant diethylaminoethyl (DEAE) groups.
- the matrices can be acrylamide, agarose, dextran, cellulose, or other types commonly employed in protein purification.
- a cation exchange step is employed.
- Suitable cation exchangers include various insoluble matrices comprising sulfopropyl or carboxymethyl groups.
- a hydroxyapatite media is employed, including but not limited to, ceramic hydroxyapatite (CHT).
- CHT ceramic hydroxyapatite
- one or more reverse-phase HPLC steps employing hydrophobic RP- HPLC media, e.g. , silica gel having pendant methyl or other aliphatic groups are employed to further purify a recombinant protein.
- hydrophobic interaction chromatography HIC is used to separate recombinant proteins based on their hydrophobicity.
- HIC is a useful separation technique for purifying proteins while maintaining biological activity due to the use of conditions and matrices that operate under less denaturing conditions than some other techniques.
- GCGR-binding proteins of the present disclosure may be analyzed for their physical/chemical properties and/or biological activities by various assays known in the art.
- a GCGR-binding protein e.g. , an anti-GCGR antibody
- Binding assays include, but are not limited to, Biacore, ELISA, and FACS.
- antibodies generated against GCGR are characterized based upon their binding properties.
- antibodies are grouped together based upon the epitope each individual antibody recognizes and/or binds to, a process known as "epitope binning".
- epitope binning antibodies are tested in a pairwise combinatorial manner and antibodies that compete with each other (i.e. , bind the same or similar epitopes) are grouped together into bins. For example, in a binning assay, a first antibody is immobilized on a surface and a premixed solution of a second antibody and antigen/target protein is flowed over the immobilized first antibody.
- the antigen/target protein is immobilized on a surface and the two antibodies are flowed over the immobilized antigen and compete to bind to the immobilized antigen/target protein.
- antibodies that block one another can be identified.
- a competitive blocking profile is created for each antibody relative to the other antibodies. The results determine which bin each antibody is placed in.
- High-throughput methods of epitope binning are known in the art and allow for screening and characterization of large numbers of antibodies within a short period of time.
- Antibodies that bind similar epitopes often share similar functions. Conversely, antibodies that bind different epitopes may have different functional activities.
- Epitope mapping is the process of identifying the binding site (e.g. , epitope) on a target protein where an antibody (or other binding agent) binds.
- a variety of methods are known in the art for mapping binding sites and/or epitopes on target proteins. These methods include mutagenesis, including but not limited to, shotgun mutagenesis, site-directed mutagenesis, and alanine scanning mutagenesis; domain or fragment scanning; peptide scanning (e.g. , Pepscan technology); display methods (e.g. , phage display, microbial display, and ribosome/mRNA display); methods involving proteolysis and mass spectroscopy; and structural determination (e.g.
- anti-GCGR antibodies are characterized by assays including, but not limited to, N-terminal sequencing, amino acid analysis, high pressure liquid chromatography (HPLC), mass spectrometry, ion exchange chromatography, and papain digestion.
- assays including, but not limited to, N-terminal sequencing, amino acid analysis, high pressure liquid chromatography (HPLC), mass spectrometry, ion exchange chromatography, and papain digestion.
- a GCGR-binding protein (e.g. , an anti-GCGR antibody) is tested for its ability to modulate GCGR activity.
- assays are provided for identifying anti- GCGR antibodies that enhance GCGR activity.
- assays are provided for identifying anti-GCGR antibodies that inhibit GCGR activity.
- Cyclic AMP (cAMP) is one of the most important GPCR intracellular mediators. In many cell types, cAMP production results from the regulation of adenylate cyclase by the Ga subunit of a G-protein. For example, activation of GCGR by glucagon results in production of cAMP.
- GCGR activation can be assessed by assaying for production of cAMP and in turn, GCGR antagonists can be screened for their ability to inhibit cAMP production.
- cells are prepared and dispensed into plates and then incubated with a GCGR-binding protein (e.g. , an anti-GCGR antibody). After an appropriate period of time, the cell/GCGR-binding protein mixture is incubated with glucagon. Finally, cAMP levels are determined in the cells treated with the GCGR-binding proteins and compared to the cAMP levels in appropriate control cells.
- the IC50 of a GCGR antagonist e.g. , an anti-GCGR antibody
- IC50 refers to the half maximal inhibitory concentration of an agent and is a measure of the effectiveness of the agent in inhibiting a specific biological or biochemical function.
- an anti-GCGR antibody is attached to a second molecule.
- an anti-GCGR antibody is conjugated to a cytotoxic agent or moiety.
- an anti-GCGR antibody is conjugated to a cytotoxic agent to form an ADC (antibody-drug conjugate).
- the cytotoxic agent is a chemotherapeutic agent including, but not limited to, methotrexate, adriamycin/doxorubicin, melphalan, mitomycin C, chlorambucil, duocarmycin, daunorubicin, pyrrolobenzodiazepines (PBDs), or other intercalating agents.
- the cytotoxic agent is a microtubule inhibitor including, but not limited to, auristatins, maytansinoids (e.g. , DMI and DM4), and tubulysins.
- the cytotoxic agent is an enzymatically active toxin of bacterial, fungal, plant, or animal origin, or fragments thereof, including, but not limited to, diphtheria A chain, non-binding active fragments of diphtheria toxin, exotoxin A chain, ricin A chain, abrin A chain, modeccin A chain, alpha-sarcin, Aleurites fordii proteins, dianthin proteins, Phytolaca americana proteins (PAPI, PAPII, and PAP-S), Momordica charantia inhibitor, curcin, crotin, Sapaonaria officinalis inhibitor, gelonin, mitogellin, restrictocin, phenomycin, enomycin, and the tricothecenes.
- diphtheria A chain non-binding active fragments of diphtheria toxin
- exotoxin A chain exotoxin A chain
- ricin A chain abrin A chain
- modeccin A chain
- a GCGR-binding protein e.g. , an antibody
- a GCGR-binding protein is conjugated to one or more small molecule toxins, such as calicheamicins, maytansinoids, trichothenes, and CC 1065.
- small molecule toxins such as calicheamicins, maytansinoids, trichothenes, and CC 1065.
- a derivative of any of these toxins can also be used, as long as the derivative retains cytotoxic activity.
- Conjugates comprising a protein (e.g. , an antibody) may be made using any suitable method known in the art.
- conjugates are made using a variety of bifunctional protein- coupling agents such as N-succinimidyl-3-(2-pyridyidithiol) propionate (SPDP), iminothiolane (IT), bifunctional derivatives of imidoesters (such as dimethyl adipimidate HC1), active esters (such as disuccinimidyl suberate), aldehydes (such as glutaraldehyde), bis-azido compounds (such as bis(p- azidobenzoyl) hexanediamine), bis-diazonium derivatives (such as bis-(p-diazoniumbenzoyl)- ethylenediamine), diisocyanates (such as toluene 2,6-diisocyanate), and bis-active fluorine compounds (such as l,
- SPDP N-
- a GCGR-binding protein (e.g., an anti-GCGR antibody) is conjugated to a detectable substance or molecule that allows the protein to be used for diagnosis and/or detection.
- the detectable substance may be selected from a group including but not limited to, enzymes, such as horseradish peroxidase, alkaline phosphatase, beta-galactosidase, and acetylcholinesterase; prosthetic groups, such as streptavidin/biotin and avidin/biotin; fluorescent materials, such as, umbelliferone, fluorescein, fluorescein isothiocynate, rhodamine, dichlorotriazinylamine fluorescein, dansyl chloride, and phycoerythrin; bioluminescent materials, such as luciferase, luciferin, and aequorin;
- chemiluminescent materials such as luminol and acridinium
- radioactive materials such as 131 I, 125 I, 123 I, 121 I, 14 C, 35 S, 3 H, 115 In, 113 In, 112 In, m In, 99m Tc, 201 Ti, 68 Ga, 67 Ga, 103 Pd, "Mo, 133 Xe, 18 F, 153 Sm, 177 Lu, 159 Gd, 149 Pm, 140 La, 175 Yb, 166 Ho, 90 Y, 47 Sc, 186 Re, 188 Re, 142 Pr, 105 Rh, 97 Ru, 68 Ge, 57 Co, 65 Zn, 85 Sr, 32 P, 153 Gd, 169 Yb, 51 Cr, 54 Mn, 75 Se, 113 Sn, 67 Cu, 212 Bi, and 117 Sn; positron emitting metals; and non-radioactive paramagnetic metal ions.
- a GCGR-binding protein e.g., an anti-GCGR antibody
- a second antibody to form an antibody heteroconjugate
- a GCGR-binding protein e.g., an anti-GCGR antibody
- a solid support include, but are not limited to, glass, cellulose, polyacrylamide, nylon, polystyrene, polyvinyl chloride, or polypropylene.
- the disclosure encompasses polynucleotides comprising polynucleotides encoding a GCGR-binding protein described herein.
- polynucleotides encoding a polypeptide encompasses a polynucleotide that includes only coding sequences for the polypeptide as well as a polynucleotide which includes additional coding and/or non-coding sequences.
- the polynucleotides of the disclosure can be in the form of RNA or in the form of DNA.
- DNA includes cDNA, genomic DNA, and synthetic DNA; and can be double-stranded or single-stranded, and if single stranded can be the coding strand or non-coding (anti-sense) strand.
- a polynucleotide comprises a polynucleotide (e.g., a nucleotide sequence) encoding a polypeptide comprising an amino acid sequence selected from the group consisting of: SEQ ID NOs:220, 221, 25, 26, 51, 52, 71, 72, 97, 98, 122, 123, 144, 145, 164, 165, 188, 189, 203, 204, 218, and 219.
- a polynucleotide comprises a polynucleotide (e.g., a nucleotide sequence) encoding a polypeptide comprising an amino acid sequence selected from the group consisting of: SEQ ID NOs:233, 234, 235, and 236.
- a polynucleotide comprises a polynucleotide (e.g., a nucleotide sequence) encoding a polypeptide comprising more than one amino acid sequence selected from the group consisting of: SEQ ID NOs: 220, 221, 25, 26, 51, 52, 71, 72, 97, 98, 122, 123, 144, 145, 164, 165, 188, 189, 203, 204, 218, and 219.
- a polynucleotide comprises a polynucleotide (e.g.
- a polynucleotide comprises a polynucleotide (e.g., a nucleotide sequence) encoding a polypeptide comprising SEQ ID NO:233 and SEQ ID NO:235.
- a polynucleotide comprises a polynucleotide (e.g. , a nucleotide sequence) encoding a polypeptide comprising SEQ ID NO:234 and SEQ ID NO:236.
- a polynucleotide comprises a polynucleotide having a nucleotide sequence at least about 80% identical, at least about 85% identical, at least about 90% identical, at least about 95% identical, and in some embodiments, at least about 96%, 97%, 98%, or 99% identical to a polynucleotide encoding an amino acid sequence selected from the group consisting of: SEQ ID
- a polynucleotide comprises a polynucleotide having a nucleotide sequence at least about 80% identical, at least about 85% identical, at least about 90% identical, at least about 95% identical, and in some embodiments, at least about 96%, 97%, 98%, or 99% identical to a polynucleotide encoding an amino acid sequence selected from the group consisting of: SEQ ID NOs:233, 234, 235, and 236. Also provided is a polynucleotide that comprises a polynucleotide that hybridizes to a
- polynucleotide encoding an amino acid sequence selected from the group consisting of: SEQ ID NOs:
- a polynucleotide comprises the coding sequence for a polypeptide (e.g.
- an antibody fused in the same reading frame to a polynucleotide which aids, for example, in expression and secretion of a polypeptide from a host cell (e.g., a leader sequence which functions as a secretory sequence for controlling transport of a polypeptide).
- a polypeptide e.g., a leader sequence which functions as a secretory sequence for controlling transport of a polypeptide.
- the polypeptide can have the leader sequence cleaved by the host cell to form a "mature" form of the polypeptide.
- a polynucleotide comprises the coding sequence for a polypeptide (e.g. , an antibody) fused in the same reading frame to a marker or tag sequence.
- a marker sequence is a hexa-histidine tag supplied by a vector that allows efficient purification of the polypeptide fused to the marker in the case of a bacterial host.
- a marker sequence is a hemagglutinin (HA) tag derived from the influenza hemagglutinin protein when a mammalian host (e.g., COS-7 cells) is used.
- the marker sequence is a FLAG-tag.
- a marker may be used in conjunction with other affinity tags.
- the present disclosure further relates to variants of the polynucleotides described herein, wherein the variant encodes, for example, fragments, analogs, and/or derivatives of a polypeptide.
- the present disclosure provides a polynucleotide comprising a polynucleotide having a nucleotide sequence at least about 80% identical, at least about 85% identical, at least about 90% identical, at least about 95% identical, and in some embodiments, at least about 96%, 97%, 98% or 99% identical to a polynucleotide encoding a polypeptide comprising a GCGR-binding protein described herein.
- a polynucleotide having a nucleotide sequence at least, for example, 95% identical to a reference nucleotide sequence is intended to mean that the nucleotide sequence of the polynucleotide is identical to the reference sequence except that the polynucleotide sequence can include up to five point mutations per each 100 nucleotides of the reference nucleotide sequence.
- a polynucleotide having a nucleotide sequence at least 95% identical to a reference nucleotide sequence up to 5% of the nucleotides in the reference sequence can be deleted or substituted with another nucleotide, or a number of nucleotides up to 5% of the total nucleotides in the reference sequence can be inserted into the reference sequence.
- These mutations of the reference sequence can occur at the 5 Or 3' terminal positions of the reference nucleotide sequence or anywhere between those terminal positions, interspersed either individually among nucleotides in the reference sequence or in one or more contiguous groups within the reference sequence.
- the polynucleotide variants can contain alterations in the coding regions, non-coding regions, or both.
- a polynucleotide variant contains alterations that produce silent substitutions, additions, or deletions, but does not alter the properties or activities of the encoded polypeptide.
- a polynucleotide variant comprises silent substitutions that results in no change to the amino acid sequence of the polypeptide (due to the degeneracy of the genetic code).
- Polynucleotide variants can be produced for a variety of reasons, for example, to optimize codon expression for a particular host (/ ' . e.
- a polynucleotide variant comprises at least one silent mutation in a non-coding or a coding region of the sequence.
- a polynucleotide variant is produced to modulate or alter expression (or expression levels) of the encoded polypeptide. In some embodiments, a polynucleotide variant is produced to increase expression of the encoded polypeptide. In some embodiments, a polynucleotide variant is produced to decrease expression of the encoded polypeptide. In some embodiments, a polynucleotide variant has increased expression of the encoded polypeptide as compared to a parental polynucleotide sequence. In some embodiments, a polynucleotide variant has decreased expression of the encoded polypeptide as compared to a parental polynucleotide sequence.
- the polynucleotides are isolated. In some embodiments, the polynucleotides are substantially pure.
- an expression vector comprises a polynucleotide molecule.
- a host cell comprises an expression vector.
- a host cell comprises an expression vector comprising a polynucleotide molecule.
- a host cell comprises a polynucleotide molecule.
- a GCGR-binding protein of the present disclosure may be used in, for example, in vitro, ex vivo, and in vivo therapeutic methods.
- the present disclosure provides methods, either in vivo or in vitro, comprising exposing a cell to a GCGR-binding protein (e.g. , an anti-GCGR antibody).
- GCGR-binding proteins e.g. , antibodies
- a method for treating a disease, disorder or condition in a subject comprises administering to the subject an effective amount of an anti- GCGR antibody described herein.
- a method for treating a disease, disorder, or condition in a subject comprises administering to a subject an effective amount of a pharmaceutical formulation comprising an anti-GCGR antibody described herein and, optionally, at least one additional therapeutic agent.
- a GCGR-binding protein described herein is administered to a human for therapeutic purposes.
- a GCGR-binding protein described herein is administered to a non-human mammal (e.g. , a primate, dog, cat, pig, rat, or mouse).
- a GCGR-binding protein is administered to a non-human mammal for veterinary purposes or for testing in an animal model of human disease.
- animal models are useful for evaluating the therapeutic efficacy of a GCGR-binding protein described herein (e.g., testing of dosages and/or time courses of administration).
- a GCGR-binding protein (e.g., an antibody) described herein is useful in methods for inhibiting GCGR activity. In some embodiments, a GCGR-binding protein (e.g. , an antibody) described herein is useful in methods for inhibiting glucagon activity. In some embodiments, a GCGR-binding protein (e.g., an antibody) described herein is useful in methods for reducing or lowering blood glucose levels. In some embodiments, a GCGR-binding protein (e.g. , an antibody) described herein is useful in methods for increasing blood C-peptide levels. In some embodiments, a GCGR- binding protein (e.g.
- an antibody described herein is useful in methods for increasing blood insulin levels.
- a GCGR-binding protein (e.g. , an antibody) described herein is useful in methods for increasing pancreatic levels of insulin.
- the GCGR-binding protein is an anti-GCGR antibody selected from the group consisting of 6B5, 3H5, 5B 1 1, 1C 1, 1C3, 1H2, 4F8, 13G9, 14F4, and 14E9.
- the GCGR-binding protein is an antibody that comprises: a heavy chain CDRl comprising SEQ ID NO: 1, a heavy chain CDR2 comprising SEQ ID NO: 2, a heavy chain CDR3 comprising SEQ ID NO:3, a light chain CDRl comprising SEQ ID NO:4, a light chain CDR2 comprising SEQ ID NO:5, and a light chain CDR3 comprising SEQ ID NO:6.
- the GCGR-binding protein is an antibody that comprises a heavy chain variable region comprising SEQ ID NO: 25 and a light chain variable region comprising SEQ ID NO: 26.
- the GCGR-binding protein is an antibody that comprises a heavy chain variable region comprising SEQ ID NO: 220 and a light chain variable region comprising SEQ ID NO:221. In some embodiments of the methods described herein, the GCGR-binding protein is anti- GCGR antibody Hz6B5.
- a GCGR-binding protein (e.g., an antibody) described herein is useful in methods for treating hyperglycemia. In some embodiments, a GCGR-binding protein (e.g., an antibody) described herein is useful in methods for treating diabetes. In some embodiments, a GCGR-binding protein (e.g., an antibody) described herein is useful in methods for treating Type 1 diabetes. In some embodiments, a GCGR-binding protein (e.g. , an antibody) described herein is useful in methods for treating Type 2 diabetes.
- the GCGR-binding protein is an anti-GCGR antibody selected from the group consisting of 6B5, 3H5, 5B 1 1, 1C 1, 1C3, 1H2, 4F8, 13G9, 14F4, and 14E9.
- the GCGR-binding protein is an antibody that comprises: a heavy chain CDR1 comprising SEQ ID NO: 1, a heavy chain CDR2 comprising SEQ ID NO: 2, a heavy chain CDR3 comprising SEQ ID NO: 3, a light chain CDR1 comprising SEQ ID NO:4, a light chain CDR2 comprising SEQ ID NO:5, and a light chain CDR3 comprising SEQ ID NO:6.
- the GCGR-binding protein is an antibody that comprises a heavy chain variable region comprising SEQ ID NO:25 and a light chain variable region comprising SEQ ID NO: 26. In some embodiments of the methods described herein, the GCGR-binding protein is an antibody that comprises a heavy chain variable region comprising SEQ ID NO: 220 and a light chain variable region comprising SEQ ID NO: 221. In some embodiments of the methods described herein, the GCGR-binding protein is anti-GCGR antibody Hz6B5.
- a GCGR-binding protein (e.g., an antibody) described herein is useful for treatment of a disease, disorder, or condition associated with beta cell dysfunction.
- a GCGR-binding protein (e.g. , an antibody) described herein is useful for treatment of a beta cell defective disease, disorder, or condition.
- the phrase "a disease, disorder, or condition associated with beta cell dysfunction” is used interchangeably with the phrase "a beta cell defective disease, disorder, or condition”.
- a disease, disorder, or condition associated with beta cell dysfunction refers to any disease that is completely or partially caused by or is the result of a defect or deficiency in beta cells.
- the disease, disorder, or condition associated with beta cell dysfunction is diabetes mellitus.
- the disease, disorder, or condition associated with beta cell dysfunction is insulin-dependent or Type 1 diabetes (e.g. , juvenile diabetes, brittle diabetes, insulin-dependent diabetes mellitus (IDDM)).
- the disease, disorder, or condition associated with beta cell dysfunction is non-insulin-dependent diabetes mellitus (NIDDM)/Type 2 diabetes.
- the disease, disorder, or condition associated with beta cell dysfunction is latent autoimmune diabetes of adults (LADA).
- the disease, disorder, or condition associated with beta cell dysfunction is a dyslipidemia and one of its sequelae (e.g.
- hyperlipidemia hyperglycemia
- a hyperglycemic-related disorder e.g., kidney damage (e.g. , tubule damage or nephropathy), liver degeneration, eye damage (e.g., diabetic retinopathy or cataracts), and diabetic foot disorders
- hypercholesterolemia hypertriglyceridemia, hypertension, cardiovascular disease, stroke, heart failure, hyperinsulinemia, a diabetic complication, glucose intolerance, insulin resistance, abnormal glucose metabolism, "pre-diabetes” (impaired fasting glucose or impaired glucose tolerance), obesity (including co-morbid conditions of obesity, such as, but not limited to, obstructive sleep apnea, nonalcoholic fatty liver disease (NAFLD), nonalcoholic steatohepatitis (NASH), and polycystic ovarian syndrome), or an undesirable body weight or mass (e.g., a greater than normal body mass index, or "
- the disease, disorder, or condition associated with beta cell dysfunction is NAFLD. In some embodiments, the disease, disorder, or condition associated with beta cell dysfunction is NASH.
- the GCGR-binding protein is an anti- GCGR antibody selected from the group consisting of 6B5, 3H5, 5B 11, 1C 1, 1C3, 1H2, 4F8, 13G9, 14F4, and 14E9.
- the GCGR-binding protein is an antibody that comprises: a heavy chain CDR1 comprising SEQ ID NO: 1, a heavy chain CDR2 comprising SEQ ID NO:2, a heavy chain CDR3 comprising SEQ ID NO:3, a light chain CDR1 comprising SEQ ID NO:4, a light chain CDR2 comprising SEQ ID NO:5, and a light chain CDR3 comprising SEQ ID NO:6.
- the GCGR-binding protein is an antibody that comprises a heavy chain variable region comprising SEQ ID NO:25 and a light chain variable region comprising SEQ ID NO: 26.
- the GCGR-binding protein is an antibody that comprises a heavy chain variable region comprising SEQ ID NO: 220 and a light chain variable region comprising SEQ ID NO: 221. In some embodiments of the methods described herein, the GCGR-binding protein is anti-GCGR antibody Hz6B5.
- a method described herein includes treating, preventing, or alleviating a disease, disorder, or condition, including treating, preventing, or alleviating one or more symptoms of a disease, disorder, or condition in a subject.
- a disease, disorder, or condition to be treated or prevented includes a glucose utilization disorder and the sequelae associated therewith, including diabetes mellitus (Type 1 and Type 2), gestational diabetes, hyperglycemia, insulin resistance, abnormal glucose metabolism, "pre-diabetes", or other physiological disorders associated with, or that result from, a hyperglycemic condition, including, for example, histopathological changes such as pancreatic beta cell destruction.
- a subject with a disease, disorder, or condition in need of treatment has a fasting blood glucose level greater than about 100 mg/dL.
- Other hyperglycemic- related disorders include but are not limited to, kidney damage (e.g., tubule damage or nephropathy), liver degeneration, eye damage (e.g., diabetic retinopathy or cataracts), and diabetic foot disorders.
- a disease, disorder, or condition to be treated or prevented includes a dyslipidemia and the sequelae associated therewith, such as atherosclerosis, coronary artery disease, cerebrovascular disorders and the like.
- a disease, disorder, or condition to be treated or prevented is associated with metabolic syndrome, including, but not limited to, obesity and elevated body mass, NAFLD, NASH, PCOS, thromboses, hypercoagulable and prothrombotic states (arterial and venous), hypertension, cardiovascular disease, stroke, and heart failure.
- a disease, disorder, or condition to be treated or prevented is obesity.
- a disease, disorder, or condition to be treated or prevented is NAFLD.
- a disease, disorder, or condition to be treated or prevented is NASH.
- a disease, disorder, or condition to be treated or prevented includes atherosclerosis, chronic inflammatory bowel diseases (e.g., Crohn's disease and ulcerative colitis), asthma, lupus erythematosus, arthritis, or other inflammatory rheumatic disorders.
- a disease, disorder, or condition to be treated or prevented includes adipose cell tumors, lipomatous carcinomas including, for example, liposarcomas, solid tumors, and neoplasms.
- a disease, disorder, or condition to be treated or prevented includes
- neurodegenerative diseases and/or demyelinating disorders of the central and peripheral nervous systems and/or neurological diseases involving neuroinflammatory processes and/or other peripheral neuropathies including Alzheimer's disease, multiple sclerosis, Parkinson's disease, progressive multifocal
- a disease, disorder, or condition to be treated or prevented includes skin and dermatological disorders and/or disorders of wound healing processes, including erythemato-squamous dermatoses.
- a disease, disorder, or condition to be treated or prevented includes syndrome X, osteoarthritis, and acute respiratory distress syndrome.
- the GCGR-binding protein is an anti-GCGR antibody selected from the group consisting of 6B5, 3H5, 5B11, 1C1, 1C3, 1H2, 4F8, 13G9, 14F4, and 14E9.
- the GCGR-binding protein is an antibody that comprises: a heavy chain CDR1 comprising SEQ ID NO: 1, a heavy chain CDR2 comprising SEQ ID NO: 2, a heavy chain CDR3 comprising SEQ ID NO: 3, a light chain CDR1 comprising SEQ ID NO:4, a light chain CDR2 comprising SEQ ID NO:5, and a light chain CDR3 comprising SEQ ID NO:6.
- the GCGR-binding protein is an antibody that comprises a heavy chain variable region comprising SEQ ID NO:25 and a light chain variable region comprising SEQ ID NO: 26.
- the GCGR-binding protein is an antibody that comprises a heavy chain variable region comprising SEQ ID NO: 220 and a light chain variable region comprising SEQ ID NO: 221. In some embodiments of the methods described herein, the GCGR-binding protein is anti-GCGR antibody Hz6B5.
- a GCGR-binding protein (e.g. , an antibody) described herein is used to treat or prevent a disease, disorder, or condition, including, for example, hyperglycemia, Type 1 diabetes, Type 2 diabetes, obesity, dyslipidemia, NASH, cardiovascular disease, metabolic syndrome or broadly any disease, disorder, or condition in which it is desirable to inhibit the in vivo effects of glucagon.
- the GCGR-binding protein is an anti-GCGR antibody selected from the group consisting of 6B5, 3H5, 5B 11, 1C1, 1C3, 1H2, 4F8, 13G9, 14F4, and 14E9.
- the GCGR-binding protein is an antibody that comprises: a heavy chain CDR1 comprising SEQ ID NO: 1, a heavy chain CDR2 comprising SEQ ID NO: 2, a heavy chain CDR3 comprising SEQ ID NO: 3, a light chain CDR1 comprising SEQ ID NO: 4, a light chain CDR2 comprising SEQ ID NO: 5, and a light chain CDR3 comprising SEQ ID NO: 6.
- the GCGR-binding protein is an antibody that comprises a heavy chain variable region comprising SEQ ID NO:25 and a light chain variable region comprising SEQ ID NO:26.
- the GCGR-binding protein is an antibody that comprises a heavy chain variable region comprising SEQ ID NO:220 and a light chain variable region comprising SEQ ID NO:221. In some embodiments of the methods described herein, the GCGR-binding protein is anti-GCGR antibody Hz6B5.
- a method of treating Type 1 diabetes in a subject comprises administering to the subject a therapeutically effective amount of an anti-GCGR antibody described herein.
- Type 1 diabetes is an autoimmune disease condition characterized by high blood glucose levels resulting from a loss of pancreatic beta cell mass and/or function and a loss of insulin production.
- Type 1 diabetes symptoms are generally the result of hyperglycemia and a breakdown of body fat. Symptoms include, but are not limited to, excessive thirst (polydipsia), frequent urination (polyuria), extreme hunger (polyphagia), extreme fatigue, weight loss, and ketones present in their urine.
- the Type 1 diabetes is latent autoimmune diabetes of adults (LADA).
- the anti-GCGR antibody is selected from the group consisting of 6B5, 3H5, 5B 1 1, 1C1, 1C3, 1H2, 4F8, 13G9, 14F4, and 14E9.
- the anti-GCGR antibody comprises a heavy chain CDR1 comprising SEQ ID NO: 1, a heavy chain CDR2 comprising SEQ ID NO: 2, a heavy chain CDR3 comprising SEQ ID NO:3, a light chain CDR1 comprising SEQ ID NO:4, a light chain CDR2 comprising SEQ ID NO:5, and a light chain CDR3 comprising SEQ ID NO: 6.
- the anti-GCGR antibody comprises a heavy chain variable region comprising SEQ ID NO:25 and a light chain variable region comprising SEQ ID NO: 26. In some embodiments, the anti-GCGR antibody comprises a heavy chain variable region comprising SEQ ID NO: 220 and a light chain variable region comprising SEQ ID NO:221. In some embodiments, the anti-GCGR antibody is Hz6B5.
- a method of treating Type 2 diabetes in a subject comprises administering to the subject a therapeutically effective amount of an anti-GCGR antibody described herein.
- Type 2 diabetes results from insulin resistance and/or reduced insulin secretion.
- Type 2 diabetes many subjects with Type 2 diabetes also have significantly reduced pancreatic beta cell mass and function, which ultimately results in an insulin deficiency.
- Symptoms of Type 2 diabetes include, but are not limited to, hyperglycemia, fatigue, dry or itchy skin, blurred vision, increased thirst, frequent urination, slow healing cuts or sores, high rate of infections, and numbness or tingling in the feet. If left untreated, more serious symptoms can result, including severe hyperglycemia (e.g., glucose levels over 600 mg/dL), lethargy, confusion, shock, and/or a hyperosmolar hyperglycemic nonketotic coma.
- severe hyperglycemia e.g., glucose levels over 600 mg/dL
- lethargy e.g., confusion, shock, and/or a hyperosmolar hyperglycemic nonketotic coma.
- the anti-GCGR antibody is selected from the group consisting of 6B5, 3H5, 5B 1 1, 1C1, 1C3, 1H2, 4F8, 13G9, 14F4, and 14E9.
- the anti-GCGR antibody comprises: a heavy chain CDRl comprising SEQ ID NO: 1, a heavy chain CDR2 comprising SEQ ID NO:2, a heavy chain CDR3 comprising SEQ ID NO:3, a light chain CDRl comprising SEQ ID NO:4, a light chain CDR2 comprising SEQ ID NO: 5, and a light chain CDR3 comprising SEQ ID NO: 6.
- the anti-GCGR antibody comprises a heavy chain variable region comprising SEQ ID NO: 25 and a light chain variable region comprising SEQ ID NO: 26. In some embodiments, the anti- GCGR antibody comprises a heavy chain variable region comprising SEQ ID NO: 220 and a light chain variable region comprising SEQ ID NO:221. In some embodiments, the anti-GCGR antibody is Hz6B5.
- a method of treating hyperglycemia in a subject comprises administering to the subject a therapeutically effective amount of an anti-GCGR antibody described herein.
- hyperglycemia or “hyperglycemic” when used in reference to a disease, disorder, or condition of a subject refers to a transient or chronic abnormally high level of glucose present in the blood of a subject.
- the disease, disorder, or condition may be caused by a delay in glucose metabolism or absorption such that the subject exhibits glucose intolerance or a state of elevated glucose not typically found in normal subjects.
- the anti-GCGR antibody is selected from the group consisting of 6B5, 3H5, 5B 1 1, 1C1, 1C3, 1H2, 4F8, 13G9, 14F4, and 14E9.
- the anti-GCGR antibody comprises: a heavy chain CDRl comprising SEQ ID NO: 1, a heavy chain CDR2 comprising SEQ ID NO: 2, a heavy chain CDR3 comprising SEQ ID NO:3, a light chain CDRl comprising SEQ ID NO:4, a light chain CDR2 comprising SEQ ID NO:5, and a light chain CDR3 comprising SEQ ID NO: 6.
- the anti-GCGR antibody comprises a heavy chain variable region comprising SEQ ID NO:25 and a light chain variable region comprising SEQ ID NO: 26.
- the anti-GCGR antibody comprises a heavy chain variable region comprising SEQ ID NO: 220 and a light chain variable region comprising SEQ ID NO:221.
- the anti-GCGR antibody is Hz6B5.
- a method of treating obesity or an undesirable body mass in a subject comprises administering to the subject a therapeutically effective amount of an anti-GCGR antibody described herein.
- a subject has a body mass index greater than 25, for example, 25-30, 30-35, 35-40, or greater than 40.
- the anti-GCGR antibody is selected from the group consisting of 6B5, 3H5, 5B 1 1, 1C 1, 1C3, 1H2, 4F8, 13G9, 14F4, and 14E9.
- the anti-GCGR antibody comprises: a heavy chain CDR1 comprising SEQ ID NO: 1, a heavy chain CDR2 comprising SEQ ID NO: 2, a heavy chain CDR3 comprising SEQ ID NO: 3, a light chain CDR1 comprising SEQ ID NO: 4, a light chain CDR2 comprising SEQ ID NO: 5, and a light chain CDR3 comprising SEQ ID NO: 6.
- the anti-GCGR antibody comprises a heavy chain variable region comprising SEQ ID NO: 25 and a light chain variable region comprising SEQ ID NO: 26.
- the anti- GCGR antibody comprises a heavy chain variable region comprising SEQ ID NO: 220 and a light chain variable region comprising SEQ ID NO:221.
- the anti-GCGR antibody is Hz6B5.
- a method of treating a disease, disorder, or condition associated with beta cell dysfunction in a subject comprises administering to the subject a therapeutically effective amount of an anti-GCGR antibody described herein.
- a method of treating a beta cell defective disease, disorder, or condition, or a symptom thereof, in a subject comprises administering to the subject a therapeutically effective amount of an anti-GCGR antibody described herein.
- the disease, disorder, or condition is Type 1 diabetes.
- the disease, disorder, or condition is Type 2 diabetes.
- the anti-GCGR antibody is selected from the group consisting of 6B5, 3H5, 5B 11, 1C1, 1C3, 1H2, 4F8, 13G9, 14F4, and 14E9.
- the anti-GCGR antibody comprises: a heavy chain CDR1 comprising SEQ ID NO: 1, a heavy chain CDR2 comprising SEQ ID NO:2, a heavy chain CDR3 comprising SEQ ID NO:3, a light chain CDR1 comprising SEQ ID NO:4, a light chain CDR2 comprising SEQ ID NO:5, and a light chain CDR3 comprising SEQ ID NO:6.
- the anti-GCGR antibody comprises a heavy chain variable region comprising SEQ ID NO: 25 and a light chain variable region comprising SEQ ID NO:26. In some embodiments, the anti-GCGR antibody comprises a heavy chain variable region comprising SEQ ID NO:220 and a light chain variable region comprising SEQ ID NO:221. In some embodiments, the anti-GCGR antibody is Hz6B5.
- the treatment (i) reduces blood glucose levels, (ii) increases C-peptide level in the blood, (iii) increases C-peptide levels in the pancreas, (iv) reduces blood glucose levels and increases C-peptide in the blood, and/or (v) reduces blood glucose levels and increases C-peptide in the pancreas.
- the treatment reduces blood glucose levels.
- the treatment increases C-peptide level in the blood.
- the treatment increases C-peptide levels in the pancreas.
- the treatment reduces blood glucose levels and increases C-peptide in the blood. In some embodiments of the methods described herein, the treatment reduces blood glucose levels and increases C-peptide in the pancreas. In some embodiments, the treatment increases insulin level in the blood. In some embodiments, the treatment increases insulin level/content in the pancreas. [00219] In some embodiments, a method of improving beta cell function in a subject comprises administering to the subject a therapeutically effective amount of an anti-GCGR antibody described herein. In some embodiments, the improvement in beta cell function is indicated by a decrease in blood glucose, an increase in C-peptide, and/or an increase in insulin.
- the anti-GCGR antibody is selected from the group consisting of 6B5, 3H5, 5B11, 1C1, 1C3, 1H2, 4F8, 13G9, 14F4, and 14E9.
- the anti-GCGR antibody comprises: a heavy chain CDRl comprising SEQ ID NO: 1, a heavy chain CDR2 comprising SEQ ID NO: 2, a heavy chain CDR3 comprising SEQ ID NO:3, a light chain CDRl comprising SEQ ID NO: 4, a light chain CDR2 comprising SEQ ID NO: 5, and a light chain CDR3 comprising SEQ ID NO: 6.
- the anti-GCGR antibody comprises a heavy chain variable region comprising SEQ ID NO:25 and a light chain variable region comprising SEQ ID NO:26. In some embodiments, the anti-GCGR antibody comprises a heavy chain variable region comprising SEQ ID NO: 220 and a light chain variable region comprising SEQ ID NO:221. In some embodiments, the anti-GCGR antibody is Hz6B5.
- a method of reducing or lowering blood glucose levels in a subject comprises administering to the subject a therapeutically effective amount of an anti-GCGR antibody described herein.
- a method of increasing the level of insulin in the blood of a subject comprises administering to the subject a therapeutically effective amount of an anti-GCGR antibody described herein.
- a method of increasing the level of insulin in the pancreas of a subject comprises administering to the subject a therapeutically effective amount of an anti- GCGR antibody described herein.
- a method of increasing the level of C-peptide in the blood of a subject comprises administering to the subject a therapeutically effective amount of an anti- GCGR antibody described herein.
- a method of increasing the level of insulin in the blood of a subject comprises administering to the subject a therapeutically effective amount of an anti- GCGR antibody described herein.
- a method of reducing or lowering blood glucose levels and increasing the level of C-peptide in the blood of a subject comprises administering to the subject a therapeutically effective amount of an anti-GCGR antibody described herein.
- the level of C-peptide is measured in a blood sample, a serum sample, a plasma sample, or a pancreatic sample.
- the level of insulin is measured in a blood sample, a serum sample, a plasma sample, or a pancreatic sample.
- the anti-GCGR antibody is selected from the group consisting of 6B5, 3H5, 5B11, 1C1, 1C3, 1H2, 4F8, 13G9, 14F4, and 14E9.
- the anti-GCGR antibody comprises: a heavy chain CDRl comprising SEQ ID NO: 1, a heavy chain CDR2 comprising SEQ ID NO: 2, a heavy chain CDR3 comprising SEQ ID NO: 3, a light chain CDRl comprising SEQ ID NO: 4, a light chain CDR2 comprising SEQ ID NO: 5, and a light chain CDR3 comprising SEQ ID NO: 6.
- the anti-GCGR antibody comprises a heavy chain variable region comprising SEQ ID NO: 25 and a light chain variable region comprising SEQ ID NO: 26. In some embodiments, the anti- GCGR antibody comprises a heavy chain variable region comprising SEQ ID NO: 220 and a light chain variable region comprising SEQ ID NO:221. In some embodiments, the anti-GCGR antibody is Hz6B5.
- a method comprises assessing the efficacy of an anti-GCGR antibody described herein in preventing or treating a beta cell defective disease, disorder, or condition, or a symptom thereof, in a subject, wherein the method comprises comparing the beta cell function in the subject before and after administration of the antibody.
- an increase in beta cell function after administration of the antibody as compared to before administration of the antibody is indicative of the efficacy of the antibody in preventing or treating the beta cell defective disease, disorder, or condition, or symptom thereof.
- a method comprises assessing the efficacy of an anti-GCGR antibody described herein in preventing or treating a beta cell defective disease, disorder, or condition, or a symptom thereof, in a subject, wherein the method comprises comparing serum or plasma C-peptide in the subject before and after administration of the antibody. In some embodiments, an increase in serum or plasma C-peptide after administration of the antibody as compared to before administration of the antibody is indicative of the efficacy of the antibody in preventing or treating the beta cell defective disease, disorder, or condition, or symptom thereof.
- a method comprises assessing the efficacy of an anti-GCGR antibody described herein in preventing or treating a beta cell defective disease, disorder, or condition, or a symptom thereof, in a subject, wherein the method comprises comparing pancreatic gene expression of Insl, Ins 2, and/or Ngn3 in the subject before and after administration of the antibody.
- an increase in pancreatic expression of Insl, Ins 2, and/or Ngn3 after administration of the antibody as compared to before administration of the antibody is indicative of the efficacy of the antibody in preventing or treating the beta cell defective disease, disorder, or condition, or symptom thereof.
- a decrease in blood glucose after administration of the antibody as compared to before administration of the antibody is indicative of the efficacy of the antibody in preventing or treating the beta cell defective disease, disorder or condition, or symptom thereof.
- the method further comprises one or more subsequent administrations of the antibody to the subject following the assessment of efficacy.
- the anti-GCGR antibody is selected from the group consisting of 6B5, 3H5, 5B 11, 1C1, 1C3, 1H2, 4F8, 13G9, 14F4, and 14E9.
- the anti-GCGR antibody comprises: a heavy chain CDR1 comprising SEQ ID NO: 1, a heavy chain CDR2 comprising SEQ ID NO: 2, a heavy chain CDR3 comprising SEQ ID NO:3, a light chain CDR1 comprising SEQ ID NO:4, a light chain CDR2 comprising SEQ ID NO:5, and a light chain CDR3 comprising SEQ ID NO: 6.
- the anti-GCGR antibody comprises a heavy chain variable region comprising SEQ ID NO: 25 and a light chain variable region comprising SEQ ID NO: 26.
- the anti-GCGR antibody comprises a heavy chain variable region comprising SEQ ID NO: 220 and a light chain variable region comprising SEQ ID NO:221.
- the anti-GCGR antibody is Hz6B5.
- a method comprises selecting a group of subjects having beta cell defective disease, disorder, or condition, or a symptom thereof, based on beta cell function for the purposes of predicting clinical response, monitoring clinical response, or monitoring subject compliance to dosing with an anti-GCGR antibody described herein.
- the subject has increased beta cell function after treatment.
- a method comprises selecting a group of subjects having beta cell defective disease, disorder, or condition, or a symptom thereof, based on serum C-peptide, blood insulin, pancreatic insulin, and/or blood glucose for the purposes of predicting clinical response, monitoring clinical response, or monitoring subject compliance to dosing with an anti-GCGR antibody described herein.
- the subject has increased serum C-peptide, increased serum insulin, increased pancreatic insulin, and/or decreased blood glucose after treatment.
- a method comprises selecting a group of subjects having beta cell defective disease, disorder, or condition, or a symptom thereof, based on the pancreatic gene expression of Insl, Ins 2, and/or Ngn3 for the purposes of predicting clinical response, monitoring clinical response, or monitoring subject compliance to dosing with an anti-GCGR antibody described herein.
- the subject has increased pancreatic expression oilnsl, Ins 2, and/or Ngn3 after treatment.
- the levels are compared to the normal population.
- the subject is a subject in need thereof.
- the anti- GCGR antibody is selected from the group consisting of 6B5, 3H5, 5B11, 1C1, 1C3, 1H2, 4F8, 13G9, 14F4, and 14E9.
- the anti-GCGR antibody comprises: a heavy chain CDR1 comprising SEQ ID NO: 1, a heavy chain CDR2 comprising SEQ ID NO: 2, a heavy chain CDR3 comprising SEQ ID NO:3, a light chain CDR1 comprising SEQ ID NO: 4, a light chain CDR2 comprising SEQ ID NO: 5, and a light chain CDR3 comprising SEQ ID NO: 6.
- the anti-GCGR antibody comprises a heavy chain variable region comprising SEQ ID NO:25 and a light chain variable region comprising SEQ ID NO:26. In some embodiments, the anti-GCGR antibody comprises a heavy chain variable region comprising SEQ ID NO: 220 and a light chain variable region comprising SEQ ID NO:221. In some embodiments, the anti-GCGR antibody is Hz6B5.
- a method comprises administering a GCGR-binding protein (e.g., an antibody) described herein in combination with at least one additional therapeutic agent or therapeutic therapy.
- Treatment with two or more therapeutic agents often uses agents that work by different mechanisms of action, although this is not required.
- Combination therapy using agents with different mechanisms of action may result in additive or synergetic effects.
- Combination therapy may allow for a lower dose of each agent than is used in monotherapy, thereby reducing toxic side effects and/or increasing the therapeutic index of the agent(s).
- Combination therapy may decrease the likelihood that resistance to an agent will develop.
- the combination of a GCGR-binding protein (e.g. , an antibody) described herein and at least one additional therapeutic agent results in additive or synergistic results.
- the combination therapy results in an increase in the therapeutic index of the GCGR- binding protein.
- the combination therapy results in an increase in the therapeutic index of the additional therapeutic agent(s).
- the combination therapy results in a decrease in the toxicity and/or side effects of the GCGR-binding protein.
- the combination therapy results in a decrease in the toxicity and/or side effects of the additional therapeutic agent(s).
- an additional therapeutic agent can be administered prior to, concurrently with, and/or subsequently to, administration of the GCGR-binding protein.
- the at least one additional therapeutic agent comprises 1, 2, 3, or more additional therapeutic agents.
- Combined administration can include co-administration, either in a single pharmaceutical formulation or using separate formulations, or consecutive administration in either order but generally within a time period such that all active agents can exert their biological activities.
- Preparation and dosing schedules for additional therapeutic agents can be used according to manufacturers' instructions or as determined empirically by the skilled practitioner.
- the GCGR-binding protein is an anti-GCGR antibody selected from the group consisting of 6B5, 3H5, 5B 11, 1C 1, 1C3, 1H2, 4F8, 13G9, 14F4, and 14E9.
- the anti-GCGR antibody comprises: a heavy chain CDRl comprising SEQ ID NO: 1, a heavy chain CDR2 comprising SEQ ID NO: 2, a heavy chain CDR3 comprising SEQ ID NO: 3, a light chain CDRl comprising SEQ ID NO:4, a light chain CDR2 comprising SEQ ID NO:5, and a light chain CDR3 comprising SEQ ID NO:6.
- the anti-GCGR antibody comprises a heavy chain variable region comprising SEQ ID NO: 25 and a light chain variable region comprising SEQ ID NO:26. In some embodiments, the anti-GCGR antibody comprises a heavy chain variable region comprising SEQ ID NO:220 and a light chain variable region comprising SEQ ID NO:221. In some embodiments, the GCGR-binding protein is anti-GCGR antibody Hz6B5. In some embodiments, an additional therapeutic agent is a hyperglycemia or diabetes drug.
- Hyperglycemia or diabetes drugs include, but are not limited to, insulin and insulin mimetics; PPAR (peroxisome proliferator-activated receptor) ⁇ -agonists, such as pioglitazone, troglitazone, ciglitazone, rivoglitazone, rosiglitazone, and other 2,4-thiazolidinedione derivatives; DPP-4 inhibitors, such as sitagliptin (JANUVIA), vildagliptin, saxagliptin, linagliptin (TRADJENTA), dutogliptin, gemigliptin, and alogliptin (NESINA); GLP- 1 analogs, such as exenatide, liraglutide, taspoglutide, albiglutide, and lixisenatide; biguanidine derivatives, such as metformin (GLUMETZA, GLUCOPHAGE), buformin, and phenformin; ATP-sensitive
- glyclopyramide a-glucosidase inhibitors, such as miglitol (GLYSET), acarbose (PRECOSE), and voglibose
- SGLT2 inhibitors such as canagliflozin (INVOKANA), dapagliflozin (FARXIGA), and empagliflozin (JARDIANCE).
- an additional therapeutic agent is an obesity drug.
- Obesity drugs include, but are not limited to, orlistat (XENICAL), phentermine/topiramate (QSYMIA), lorcaserin (BELVIQ), naltrexone/bupropion (CONTRA VE) and liraglutide (SAXENDA).
- an additional therapeutic agent is a lipid-lowering drug or a cholesterol- lowering drug.
- Lipid-lowering drugs include, but are not limited to, fibrates, statins, omega-3 fatty acids, and niacin.
- an additional therapeutic agent is a fibrate. Fibrates are a class of amphipathic carboxylic acids and include, but are not limited to, aluminum clofibrate, bezafibrate, ciprofibrate, choline fenofibrae, clinofibrate, clofibrate (e.g.
- an additional therapeutic agent is a statin.
- Statins are HMG-CoA reductase inhibitors and include, but are not limited to, atorvastatin (LIPITOR), fluvastatin (LESCOL), lovastatin (MEVACOR), pravastatin (PRAVACHOL), rosuvastatin (ZOCOR), and pitavastatin (LIVALO).
- the additional therapeutic agent is niacin (vitamin B3).
- the additional therapeutic agent is an omega-3 fatty acid.
- an additional therapeutic agent is selected from the group including, but to limited to, glucagon receptor antagonists; GLP-1, GLP- 1 mimetics, and GLP-1 receptor agonists; GIP, GIP mimetics, and GIP receptor agonists; PACAP, PACAP mimetics, and PACAP receptor 3 agonists; cholesterol-lowering agents such as HMG-CoA reductase inhibitors, sequestrants, nicotinyl alcohol, nicotinic acid and salts thereof, PPAR alpha agonists, PPAR alpha/gamma dual agonists, inhibitors of cholesterol absorption, acyl CoA: cholesterol acyltransferase inhibitors, anti-oxidants, and LXR modulators; PPAR delta agonists; anti-obesity compounds; ileal bile acid transporter inhibitors; anti- inflammatory agents excluding glucocorticoids; protein tyrosine phosphatase- IB (PTP-I
- an additional therapeutic agent is selected from the group including, but not limited to, analgesic agents, antibiotics, or immunomodulatory agents, or any other agent listed in the U.S. Pharmacopoeia and/or Physician's Desk Reference.
- an additional therapeutic agent is a non-steroidal anti-inflammatory drug (NSAID) such as aspirin, ibuprofen, and other propionic acid derivatives (alminoprofen, benoxaprofen, bucloxic acid, carprofen, fenbufen, fenoprofen, fluprofen, flurbiprofen, indoprofen, ketoprofen, miroprofen, naproxen, oxaprozin, pirprofen, pranoprofen, suprofen, tiaprofenic acid, and tioxaprofen), acetic acid derivatives (indomethacin, acemetacin, alclofenac, clidanac, diclofenac, fenclofenac, fenclozic acid, fentiazac, fuirofenac, ibufenac, isoxepac, oxpinac, su
- an additional therapeutic agent is a cyclooxygenase-2 (COX-2) inhibitor.
- an additional therapeutic agent is a steroid such as prednisolone, prednisone, methylprednisolone, betamethasone, dexamethasone, or hydrocortisone.
- an additional therapeutic agent is a cytokine suppressive anti-inflammatory drug (CSAID) or an antibody to or antagonist of other human cytokines or growth factors such as TNF, LT, IL- ⁇ , IL-2, IL-6, IL-7, IL-8, IL- 15, IL- 16, IL-18, EMAP-II, GM-CSF, FGF, and PDGF.
- CSAID cytokine suppressive anti-inflammatory drug
- an additional therapeutic agent is a TNF antagonist such as an TNF antibody (e.g., REMICADE), an anti- TNF antibody fragment (e.g., CDP870), a soluble p55 or p75 TNF receptor or derivatives thereof, ENBREL, LENERCEPT, a soluble IL-13 receptor, a TNF -alpha converting enzyme (TACE) inhibitor, an IL- 1 inhibitor, interleukin 11, an anti-P7s, p-selectin glycoprotein ligand (PSGL), interferon-beta-la (AVONEX), interferon-beta- lb (BETASERON), Copaxone, hyperbaric oxygen, intravenous
- TNF antibody e.g., REMICADE
- an anti- TNF antibody fragment e.g., CDP870
- a soluble p55 or p75 TNF receptor or derivatives thereof ENBREL
- LENERCEPT a soluble IL-13 receptor
- TACE TNF -al
- an additional therapeutic agent is betatrophin. In some embodiments, an additional therapeutic agent is ciliary neurotrophic factor (CNTF).
- CNTF ciliary neurotrophic factor
- a GCGR-binding protein e.g., an antibody
- the GCGR-binding protein can be administered one time or over a series of treatments lasting from several days to several months, or until a cure is effected or a diminution of the disease state is achieved.
- a GCGR-binding protein e.g., an antibody
- an antibody described herein and at least one additional therapeutic agent may be administered in any order or concurrently.
- the GCGR-binding protein is administered to subjects that have previously undergone treatment with a therapeutic agent.
- the GCGR-binding protein and a second therapeutic agent is administered substantially simultaneously or concurrently.
- a subject may be given a GCGR-binding protein while undergoing a course of treatment with a second therapeutic agent (e.g. , anti -diabetic agent).
- a GCGR-binding protein is administered within 1 year of the treatment with a second therapeutic agent.
- a GCGR-binding protein is administered within 10, 8, 6, 4, or 2 months of any treatment with a second therapeutic agent. In some embodiments, a GCGR-binding protein is administered within 4, 3, 2, or 1 weeks of any treatment with a second therapeutic agent. In some embodiments, a GCGR-binding protein is administered within 5, 4, 3, 2, or 1 days of any treatment with a second therapeutic agent. It will further be appreciated that the two (or more) agents or treatments may be administered to the subject within a matter of hours or minutes (i.e. , substantially simultaneously).
- a GCGR-binding protein e.g. , an antibody
- dosage of the protein is from 0.01 ⁇ g to 100 mg/kg of body weight, from 0.1 ⁇ g to 100 mg/kg of body weight, from 1 ⁇ g to 100 mg/kg of body weight, from 1 mg to 100 mg/kg of body weight, 1 mg to 80 mg/kg of body weight from 10 mg to 100 mg/kg of body weight, from 10 mg to 75 mg/kg of body weight, or from 10 mg to 50 mg/kg of body weight.
- dosage of the protein is from about 0.1 mg to about 20 mg/kg of body weight. In some embodiments, dosage of the protein is about 0.5 mg/kg of body weight. In some embodiments, dosage of the protein is about 1 mg/kg of body weight. In some embodiments, dosage of the protein is about 1.5 mg/kg of body weight. In some embodiments, dosage of the protein is about 2 mg/kg of body weight. In some embodiments, dosage of the protein is about 2.5 mg/kg of body weight. In some embodiments, dosage of the protein is about 5 mg/kg of body weight. In some embodiments, dosage of the protein is about 7.5 mg/kg of body weight. In some embodiments, dosage of the protein is about 10 mg/kg of body weight.
- dosage of the protein is about 12.5 mg/kg of body weight. In some embodiments, dosage of the protein is about 15 mg/kg of body weight. In some embodiments, the protein is dosed once or more daily, weekly, monthly, or yearly. In some embodiments, the protein is dosed once every week, once every two weeks, once every three weeks, or once every four weeks.
- compositions comprising a GCGR-binding protein (e.g. , an antibody) described herein.
- a composition comprises an anti-GCGR antibody selected from the group consisting of 6B5, 3H5, 5B 11, 1C 1, 1C3, 1H2, 4F8, 13G9, 14F4, and 14E9.
- ta composition comprises an anti-GCGR antibody that comprises a heavy chain CDRl comprising SEQ ID NO: 1, a heavy chain CDR2 comprising SEQ ID NO: 2, a heavy chain CDR3 comprising SEQ ID NO:3, a light chain CDRl comprising SEQ ID NO: 4, a light chain CDR2 comprising SEQ ID NO: 5, and a light chain CDR3 comprising SEQ ID NO: 6.
- a composition comprises an anti-GCGR antibody that comprises a heavy chain variable region comprising SEQ ID NO: 25 and a light chain variable region comprising SEQ ID NO: 26.
- a composition comprises an anti-GCGR antibody that comprises a heavy chain variable region comprising SEQ ID NO:220 and a light chain variable region comprising SEQ ID NO:221.
- a composition comprises the anti-GCGR antibody Hz6B5.
- the present disclosure also provides pharmaceutical compositions comprising a GCGR-binding protein (e.g. , an antibody) described herein and a pharmaceutically acceptable vehicle.
- a pharmaceutical composition comprises an anti-GCGR antibody selected from the group consisting of 6B5, 3H5, 5B 1 1, 1C 1, 1C3, 1H2, 4F8, 13G9, 14F4, and 14E9.
- a pharmaceutical composition comprises an anti-GCGR antibody that comprises a heavy chain CDRl comprising SEQ ID NO: 1, a heavy chain CDR2 comprising SEQ ID NO:2, a heavy chain CDR3 comprising SEQ ID NO:3, a light chain CDRl comprising SEQ ID NO:4, a light chain CDR2 comprising SEQ ID NO:5, and a light chain CDR3 comprising SEQ ID NO:6.
- a pharmaceutical composition comprises an anti- GCGR antibody that comprises a heavy chain variable region comprising SEQ ID NO: 25 and a light chain variable region comprising SEQ ID NO:26.
- a pharmaceutical composition comprises an anti-GCGR antibody that comprises a heavy chain variable region comprising SEQ ID NO:220 and a light chain variable region comprising SEQ ID NO:221.
- a pharmaceutical composition comprises the anti-GCGR antibody Hz6B5.
- Formulations are prepared for storage and/or use by combining a purified protein or antibody of the present disclosure with a pharmaceutically acceptable vehicle (e.g., a carrier or excipient).
- a pharmaceutically acceptable vehicle e.g., a carrier or excipient.
- a pharmaceutically acceptable carrier, excipients, and/or stabilizers to be inactive ingredients of a formulation or pharmaceutical composition.
- a formulation prepared for storage of a binding protein may be different or distinct from a formulation or composition prepared for use in a subject, for example, a preparation for intravenous injection.
- Suitable pharmaceutically acceptable vehicles include, but are not limited to, nontoxic buffers such as phosphate, citrate, and other organic acids; salts such as sodium chloride; antioxidants including ascorbic acid and methionine; preservatives such as octadecyldimethylbenzyl ammonium chloride, hexamethonium chloride, benzalkonium chloride, benzethonium chloride, phenol, butyl or benzyl alcohol, alkyl parabens, such as methyl or propyl paraben, catechol, resorcinol, cyclohexanol, 3-pentanol, and m-cresol; low molecular weight polypeptides (e.g.
- the formulation is in the form of an aqueous solution. In some embodiments, the formulation is lyophilized or in an alternative dried form.
- the therapeutic formulation can be in unit dosage form.
- Such formulations include tablets, pills, capsules, powders, granules, solutions or suspensions in water or non-aqueous media, or suppositories.
- solid compositions such as tablets the principal active ingredient is mixed with a pharmaceutical carrier.
- Conventional tableting ingredients include corn starch, lactose, sucrose, sorbitol, talc, stearic acid, magnesium stearate, dicalcium phosphate or gums, and diluents (e.g. , water). These can be used to form a solid preformulation composition containing a homogeneous mixture of a compound of the present disclosure, or a non-toxic pharmaceutically acceptable salt thereof.
- the solid preformulation composition is then subdivided into unit dosage forms of a type described above.
- the tablets, pills, etc. of the formulation or composition can be coated or otherwise compounded to provide a dosage form affording the advantage of prolonged action.
- the tablet or pill can comprise an inner composition covered by an outer component.
- the two components can be separated by an enteric layer that serves to resist disintegration and permits the inner component to pass intact through the stomach or to be delayed in release.
- enteric layers or coatings such materials include a number of polymeric acids and mixtures of polymeric acids with such materials as shellac, cetyl alcohol, and cellulose acetate.
- the binding proteins of the present disclosure may be formulated in any suitable form for delivery to a target cell/tissue.
- a GCGR-binding protein e.g. , an antibody
- the pharmaceutical formulation includes a protein of the present disclosure complexed with liposomes. Methods to produce liposomes are known to those of skill in the art. For example, some liposomes are generated by reverse phase evaporation with a lipid composition comprising phosphatidylcholine, cholesterol, and PEG-derivatized
- PEG-PE phosphatidylethanolamine
- a GCGR-binding protein (e.g. , an antibody) is formulated as a sustained-release preparation.
- sustained-release preparations include semipermeable matrices of solid hydrophobic polymers containing an agent, where the matrices are in the form of shaped articles (e.g., films or microcapsules).
- Sustained-release matrices include but are not limited to polyesters, hydrogels such as poly(2-hydroxyethyl-methacrylate) or poly(vinyl alcohol), polylactides, copolymers of L-glutamic acid and 7 ethyl-L-glutamate, non-degradable ethylene-vinyl acetate, degradable lactic acid-gly colic acid copolymers such as the LUPRON DEPOTTM (injectable microspheres composed of lactic acid-glycolic acid copolymer and leuprolide acetate), sucrose acetate isobutyrate, and poly-D-(-)-3-hydroxybutyric acid.
- polyesters such as poly(2-hydroxyethyl-methacrylate) or poly(vinyl alcohol), polylactides, copolymers of L-glutamic acid and 7 ethyl-L-glutamate, non-degradable ethylene-vinyl acetate, degradable lactic acid-
- compositions or formulations of the present disclosure can be administered in any number of ways for either local or systemic treatment. Administration can be topical by epidermal or transdermal patches, ointments, lotions, creams, gels, drops, suppositories, sprays, liquids and powders; pulmonary by inhalation or insufflation of powders or aerosols, including by nebulizer, intratracheal, and intranasal; oral; or parenteral including intravenous, intraarterial, intratumoral, subcutaneous, intraperitoneal, intramuscular (e.g., injection or infusion), or intracranial (e.g., intrathecal or intraventricular).
- parenteral including intravenous, intraarterial, intratumoral, subcutaneous, intraperitoneal, intramuscular (e.g., injection or infusion), or intracranial (e.g., intrathecal or intraventricular).
- a GCGR-binding protein e.g. , an antibody
- a GCGR-binding protein e.g. , an antibody
- a composition described herein is delivered in a controlled release or sustained release system.
- a pump is used to achieve a controlled or sustained release.
- polymeric materials are used to achieve a controlled or sustained release of a GCGR-binding protein (e.g., an antibody) described herein.
- polymers used in sustained release formulations include, but are not limited to, poly 2-hydroxy ethyl methacrylate, polymethyl methacrylate, polyacrylic acid, polyethylene-co-vinyl acetate, polymethacrylic acid, polyglycolides (PLG), polyanhydrides, poly N-vinyl pyrrolidone, polyvinyl alcohol (PVA), polyacrylamide, polyethylene glycol (PEG), polylactides (PLA), polylactide-co-glycolides (PLGA), and polyorthoesters.
- Any polymer used in a sustained release formulation should be inert, free of leachable impurities, stable on storage, sterile, and biodegradable.
- additional delivery systems are used to administer a GCGR-binding protein (e.g., an antibody) described herein including, but not limited to, injectable drug delivery devices and osmotic pumps.
- injectable drug delivery devices include, for example, hand-held devices (e.g., autoinjectors) or wearable devices.
- osmotic pump systems may include single compartment systems, dual compartment systems, and multiple compartment systems.
- the anti-GCGR antibodies and fragments thereof described herein are useful for detecting GCGR in a biological sample.
- Such anti-GCGR antibodies can include those that bind to human and/or cyno GCGR, but do not inhibit GCGR activity.
- the term "detecting" as used herein encompasses quantitative or qualitative detection.
- a biological sample comprises a cell, tissue, blood, or other bodily fluid.
- a method of detecting GCGR in a biological sample comprises contacting the biological sample with an anti-GCGR antibody under conditions permissive for binding of the anti-GCGR antibody to GCGR, and detecting whether a complex is formed between the anti-GCGR antibody and GCGR.
- the methods may include assays known by those of skill in the art, such as Western blot analyses, radioimmunoassays, ELISAs (enzyme linked immunosorbent assays), "sandwich” immunoassays, immunoprecipitation assays, fluorescent immunoassays, protein A immunoassays, and immunohistochemistry (IHC).
- an anti-GCGR antibody is tagged with a detectable label.
- the detectable label may be a fluorescent molecule, a chemilumine scent molecule, a bioluminescent molecule, an enzyme, or a radioisotope.
- kits that comprise a GCGR-binding protein (e.g. , an antibody) described herein and that can be used to perform the methods described herein.
- a kit comprises at least one purified GCGR-binding protein in one or more containers.
- a GCGR-protein protein is an anti-GCGR antibody selected from the group consisting of 6B5, 3H5, 5B 1 1, 1C 1, 1C3, 1H2, 4F8, 13G9, 14F4, and 14E9.
- a GCGR-binding protein is the anti-GCGR antibody Hz6B5.
- kits contain all of the components necessary and/or sufficient to perform a detection assay, including all controls, directions for performing assays, and any necessary software for analysis and presentation of results.
- a detection assay including all controls, directions for performing assays, and any necessary software for analysis and presentation of results.
- kits that comprise a GCGR-binding protein (e.g., an antibody) as well as at least one additional therapeutic agent.
- Antibodies to glucagon receptor were generated by injecting mice (i) with cells expressing human GCGR or (ii) with a His-tagged soluble protein comprising an extracellular domain of human GCGR.
- GCGR-expressing cells were prepared as follows. CHO 3E7 cells were transfected with a nucleic acid sequence encoding human GCGR. Cells were analyzed for expression of GCGR by FACS and positive cells were isolated. The soluble protein comprising an extracellular domain of human GCGR was generated by standard recombinant techniques and purified using the His tag. Mice were immunized with a membrane preparation of the GCGR-expressing cells or the soluble GCGR protein. Mice were boosted to induce high titers. Antibody titers in serum were determined by ELISA and FACS. Single cell suspensions of lymphocytes were obtained from the spleen and draining lymph nodes of mice with suitable titers.
- Lymphocytes were fused with SP2/0 myeloma cells at a ratio of 1 : 1 by electrofusion. Fused cells were plated into 384-well plates in the presence of HAT selection media. After 10- 14 days of culture, supernatants were collected and initially screened by (i) FACS using GCGR-expressing cells or (ii) Biacore using soluble GCGR (e.g., the extracellular domain of GCGR) to identify binders.
- the next step was a injection of soluble human GCGR extracellular domain (100 nM in PBS-P buffer) at a flow rate of 50 ⁇ / ⁇ and monitoring of the binding kinetics at 25°C.
- Kinetic data were collected over time and fit using the simultaneous global fit equation to yield affinity constants (KD values) for each antibody.
- More than 1500 antibodies were identified as binding to human GCGR.
- a subset of the positive binders were purified and subsequently re-tested for their binding affinities to human GCGR and cyno GCGR.
- Antibodies were rank-ordered based on their binding affinities to human GCGR as determined by Biacore.
- Antibodies identified as binding to GCGR as described in Example 2 were evaluated in competition binding assays and/or epitope binning experiments.
- the biosensor tips with bound antibody - GCGR complex were then dipped in 6B5, 5B11, or 3H5 antibody solution and the change in signal measured as a nm shift. Results of a representative experiment are shown in Table 12. If the antibody in solution recognized the same epitope as the antibody immobilized on the chip surface, then ⁇ 0.1 nm shift in signal (noise level of Octet®) would be observed. If the antibody in solution recognized a distinct epitope relative to the immobilized antibody, an increase in signal of > 0.15 nm shift would be observed. In the latter scenario, the antibody in solution could bind to the immobilized antibody-GCGR complex (presumably to a different epitope) resulting in the observed increase in signal.
- antibody 6B5 competed with itself for binding to GCGR and also competed with antibodies 13G9, 14E9, 14F4, 4F8, 1G7, 1A8, 1H7, 1A2, 1B4, 1C1, 1H2, 1C3 and 1D2.
- antibodies 5B 11 and 3H5 also competed with antibodies 6B5, 13G9, 14E9, 14F4, 4F8, 1G7, 1A8, 1H7, 1A2, 1B4, 1C1, 1H2, 1C3 and 1D2.
- Exemplary antibodies that bind to GCGR as described in Examples 1-3 were tested for their functional activity in cell-based assays. Since glucagon stimulates cAMP via activation of GCGR, anti- GCGR antibodies were tested for their ability to inhibit glucagon-induced cAMP production. For these experiments, the level of intracellular cAMP was measured using a cAMP cell-based assay kit following the manufacturer's instructions (Cisbio). Briefly, CHO cells transfected with full-length human GCGR cDNA were seeded at 1,000 cells/well in a 384 well plate. Anti-GCGR antibodies were serially diluted using culture medium containing 5 nM glucagon (Sigma) and 5 were added to each well. Cells were incubated for one hour in the dark. Each assay plate was read using a fluorescent plate reader at 615 nm/665 nm.
- Results of several representative cAMP assays with anti-GCGR antibodies 6B5, 5B 11, 3H5, 1H7, 1A2, 1B4, 1C1, 1H2, 1C3, 13G9, 13E9, 14F4, and 4F8 are shown in Table 13. Results are shown as IC50 determinations for each antibody.
- a number of the anti-GCGR antibodies described in Examples 1-4 were selected for sequence analyses. CDRs and heavy chain and light chain variable region amino acid sequences are shown in Tables 1-10 and the heavy chain and light chain variable sequences are aligned in Figures lA-1 and 1A-2.
- An exemplary anti-GCGR antibody, 6B5 was selected for humanization. Human germline sequences which had significant similarity to the murine 6B5 heavy chain variable region and light chain variable region sequences were identified. Suitable human framework acceptors for heavy chain variable region included IGHV1-46, IGHV1-2, IGHV1-69 and IGHV5-51. Suitable acceptor sequences for light chain variable region included IGKV2-30, IGKV3-20, IGKV3-1 1 or IGKV1-39. Consideration of a multiplicity of factors, including sequence similarities, biophysical properties, and potential
- framework 4 sequences were selected using a similar approach. Sequences for mouse 6B5 heavy chain variable region and light chain variable region were searched against human immunoglobulin sequences in the Immunogenetics database (IMGT). IGHJ6- 1 as well as IGKJ2- 1 were selected as human donor sequences. The CDR sequences of murine 6B5 were then transferred (e.g. , grafted) into the corresponding positions of IGHV1-69 and IGKV2-30 and J-region residues corresponding to framework 4 were added. The resulting protein sequence was back-translated into a DNA sequence, codon optimized for expression in mammalian cells, and synthesized (GeneArt/LifeTechnologies).
- the synthesized DNA fragment was cloned using In-Fusion (Clontech) into a pTT5 vector (NRC Biotechnology Research Institute) to create a hlgGK signal peptide -humanized 6B5vH-hIgGl constant region and a hlgGK signal peptide-humanized 6B5VK-hIgGK constant region expression constructs (HC- 199-69a and LC- 199-30a respectively).
- individual residues in the framework regions were empirically selected and back-mutated to mouse residues using QuikChange site-directed mutagenesis (Agilent).
- LC- 199-30e plus an additional light chain variant with these two back mutations were tested in combination with humanized heavy chain variants.
- additional assays such as described in Examples 2-4 (e.g., binding, affinity and cAMP assays)
- HC-199-69f and LC- 199-30i were selected as humanized heavy chain variable region and light chain variable region sequences.
- Thse alanine scanning mutagenesis platform is a technique used for mapping both linear and conformational antigen epitopes by evaluating the effects of point mutations across a target protein. Single residues in a target protein are replaced by alanine one at a time to construct a mutant library. Each variant is assayed for its ability to bind to an antibody of interest. A failure of binding suggests that that amino acid is a part of or important to the binding site or epitope.
- the Hz6B5 antibody comprises a heavy variable region comprising SEQ ID NO: 220 (also referred to as HC-199-69f) and a light chain variable region comprising SEQ ID NO: 221 (also referred to as LC-199-30i).
- the wild-type GCGR extracellular domain and the alanine mutants were each transfected into 293XP cells and incubated for 24 hours.
- Antibody Hz6B5 was incubated with the transfected cells for 30 minutes at 4°C.
- the cells were incubated with a labeled anti-mouse Fc antibody (Jackson Immunore search) for 30 minutes at 4°C.
- the cells were analyzed using a flow cytometer BD (FACSCalibur instrument) and cytometric analytical software (Flow Jo).
- a serum sample from a mouse immunized with human GCGR was used as positive control to confirm expression of the alanine mutants. .
- Exemplary anti-GCGR antibodies 5B 1 1, 3H5, and 6B5 were evaluated in animal studies. Anti-GCGR antibodies were tested for their effects on blood glucose in a TET-DTA mouse model.
- TET-DTA transgenic mice were generated by crossing two transgenic lines: 1) B6.Cg- Tg(tetO-DTA), which expresses diphtheria toxin A (DTA) under the control of a tetracycline operator (tetO; also called tetracycline -responsive element (TRE) or tet-operator) and a cytomegalovirus minimal promoter; and 2) Ins2-rtTA, which expresses the reverse tetracycline-controlled transactivator (rtTA) protein under the control of the rat insulin 2 ⁇ Ins 2) promoter.
- B6.Cg- Tg(tetO-DTA) which expresses diphtheria toxin A
- DTA diphtheria toxin A
- TRE tetracycline -responsive element
- rtTA reverse tetracycline-controlled transactivator
- pancreatic beta cell expression of diphtheria toxin A is regulated by the tetracycline analog, doxycycline (dox).
- dox tetracycline
- TET-DTA transgenic mice were administered doxycycline through chow diet (2000 mg/kg). Five to six-week-old male mice were treated with doxycycline for 4 days and blood glucose levels were monitored. Within approximately 1 week, blood glucoses levels increased to approximately 500 mg/dL.
- mice were treated with anti-GCGR antibodies 3H5, 6B5, or 5B11 or control anti-KLH antibody.
- the antibodies were injected intraperitoneally at a dose of 10 mg/kg once a week for four weeks. Once a week, fed blood glucose levels were measured in tail blood using ACCU-CHEK Active test strips and an ACCU-CHEK Active meter (Roche Diagnostics) following the manufacturer's instructions.
- Plasma insulin levels, plasma C-peptide levels, and pancreatic insulin content were determined at the end of 4 weeks of treatment to assess beta cell function.
- tail blood was collected from mice in the four treatment groups.
- Whole blood (about 50 ⁇ /mouse) from mouse tail snips was collected into plain capillary tubes. Serum and blood cells were separated by spinning the tubes in an Autocrit UltraTM 3 centrifuge (Becton Dickinson).
- Autocrit UltraTM 3 centrifuge Becton Dickinson.
- Commercially available ELISA kits (ALPCO) were used for analysis of blood insulin and C- peptide following the manufacturer's instructions.
- pancreatic insulin content determination For pancreatic insulin content determination, after the mice were euthanized, approximately 50 mg of pancreatic tissue was homogenized in acid alcohol using Tissue LyserTM (QIAGEN). Samples were incubated on a rotator in a cold room overnight. After spinning down the samples for 15 minutes at 12,000 rpm, supernatants were used for analysis of insulin content by ELISA. Samples were serially diluted from 1 :20 - 1 :200 and analyzed by ELISA.
- treatment with anti-GCGR antibodies 3H5, 5B11, and 6B5 increased plasma levels of both insulin and C-peptide.
- plasma insulin levels increased approximately 4-fold as compared to treatment with a control antibody.
- plasma C-peptide increased about 2-fold as compared to the treatment with the control antibody.
- treatment with anti-GCGR antibodies 3H5, 5B 11, or 6B5 increased pancreatic insulin content.
- treatment with anti-GCGR antibody 6B5 increased pancreatic insulin content by over 10-fold as compared to treatment with a control antibody.
- Rat GCGR (SEQ ID NO:229)
- DIX1PGGX2YX3NYNX4KHKX5 wherein XI is Y, H, F, or S; X2 is Y, G, F, or D; X3 is I, T, D, N, or S; X4 is E, K, D, G, or A; X5 is G, S, or D
- RSSQX 6 IVX 7 SX 8 GNTYLE wherein X6 is S, T, or H; X7 is D, H, or Y; X8 is Y or D
Abstract
Description
Claims
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JP2019540056A JP7005638B2 (en) | 2017-01-27 | 2018-01-26 | Glucagon receptor-binding protein and how to use it |
SG11201906682YA SG11201906682YA (en) | 2017-01-27 | 2018-01-26 | Glucagon receptor binding proteins and methods of use thereof |
PE2019001477A PE20191404A1 (en) | 2017-01-27 | 2018-01-26 | GLUCAGON RECEPTOR BINDING PROTEINS AND METHODS OF USING THEM |
RU2019126781A RU2019126781A (en) | 2017-01-27 | 2018-01-26 | PROTEINS BINDING GLUCAGON RECEPTORS AND METHODS OF THEIR APPLICATION |
EP18744508.5A EP3573651A4 (en) | 2017-01-27 | 2018-01-26 | Glucagon receptor binding proteins and methods of use thereof |
CN201880011175.9A CN110520151B (en) | 2017-01-27 | 2018-01-26 | Glucagon receptor binding proteins and methods of use thereof |
KR1020197023223A KR102627311B1 (en) | 2017-01-27 | 2018-01-26 | Glucagon receptor binding protein and methods of use thereof |
AU2018213374A AU2018213374A1 (en) | 2017-01-27 | 2018-01-26 | Glucagon receptor binding proteins and methods of use thereof |
BR112019015479-5A BR112019015479A2 (en) | 2017-01-27 | 2018-01-26 | ANTIBODY AND ITS USE, CELL, COMPOSITION, POLINUCLEOTID MOLECULE, VECTOR, METHOD TO INHIBIT GCGR SIGNALING, METHOD TO REDUCE OR LOWER GLUCOSE LEVELS, METHOD TO INCREASE THE PEPTIDE LEVEL C, METHOD OF METHOD, TO TREAT DIABETES, METHOD TO TREAT HYPERGLYCEMIA, METHOD TO TREAT A DISEASE, METHOD TO IMPROVE CELL FUNCTION |
CA3048913A CA3048913A1 (en) | 2017-01-27 | 2018-01-26 | Glucagon receptor binding proteins and methods of use thereof |
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IL267638A IL267638A (en) | 2017-01-27 | 2019-06-25 | Glucagon receptor binding proteins and methods of use thereof |
PH12019501605A PH12019501605A1 (en) | 2017-01-27 | 2019-07-09 | Glucagon receptor binding proteins and methods of use thereof |
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KR20230004135A (en) * | 2021-06-30 | 2023-01-06 | 한미약품 주식회사 | Therapeutic use of a combination comprising a trigonal glucagon/GLP-1/GIP receptor agonist |
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